In Zhang Xu's previous life, there were often news reports that someone was arrested for placing pinhole cameras in a certain women's locker room, a certain women's bathhouse, and a certain women's bathroom. What Zhang Xu didn't expect was that he himself would also install monitoring equipment in the girls' bathroom one day.

This is not a distortion of human nature, nor is it a moral degradation, it is not an outburst of sex, nor is it the helplessness of hunger and thirst.

Ever since Zhang Xu discovered that Lockhart had picked up Tom Riddle's diary and the wheel of history had fallen into the gutter, he had installed a magic device for surveillance in the weeping Myrtle's bathroom. Since the monitoring equipment could not transmit signals wirelessly, he had to find time to hide himself every day to avoid myrtle and go to the bathroom to get the daily video records.

Since Myrtle often makes trouble in the bathroom, except for one or two girls who can't hold it back, basically no one usually enters this bathroom. Of course, except for the man in the current surveillance footage, he sneaked into the girls' bathroom, first checked that there was no one in every cubicle in the bathroom, walked to a faucet, said something to the faucet, and then jumped into the passage where the faucet was conjured.

In April, Zhang Xu found that Lockhart was sneaking into the girls' bathroom more and more frequently, and other preparations were basically completed, so he decided to start working.

Zhang Xu walked into a classroom and greeted two acquaintances who were busy in the classroom: "Fred, George, are you done?" ”

"It's ready." George said.

"The installation will begin tonight." Fred said.

After learning that the monster in the secret room was a basilisk, everyone organized a research group and began to study how to deal with the basilisk. The team also chose a classroom that had not been used for many years.

In order to prevent the heirs of Slytherin from infiltrating the research group, the team members are basically Muggle-born wizards and half-blood wizards, as well as the Weasley twin brothers and Zhang Xu, who are least likely to be the heirs of Slytherin.

At first, someone asked Zhang Xu if he could buy magic items from him that could protect against the basilisk.

Zhang Xu said that he couldn't help.

In fact, Zhang Xu has this level of protective items, but it is a military-grade thing, and it is used to save his life. In the school, except for Zhang Qiu, who will give Zhang Qiu when he is in danger, no one else will give it to anyone.

In fact, the iron armor charm amulet that Zhang Xu sold in the school was at the level of a police officer in Huaxia, otherwise Jinni, who was carrying two talismans, would not have been injured by the magic trap in the passage of the secret room. On the battlefield, it makes no sense to have a talisman that you can't carry mortar shells hard and then you're fine.

The research team's design idea for armor could only be changed from "not hurting" to "not dying".

It is recorded in the book that the eyes of the basilisk are staring at whoever is dead. And in several attacks this school year, the two and a cat indirectly saw the basilisk's eyes, and then were petrified.

At Zhang Xu's suggestion, the research team made a kind of goggles based on the principle of Colin's camera. The light rays are reflected by the four sets of lenses inside the goggles, and then pass through a path similar to "_Π_" before reaching the wearer's eye. In front and behind the goggles, several layers of magic crystals are also set up, giving the goggles the function of telescopes and night vision devices.

Although the goggles have not been tested in practice, since Colin is not dead, it is still theoretically possible.

After the goggles were developed, the president of the student council, who also participated in the "Tea Time After School", approached Dumbledore with the goggles, and after some fooling around, he got the funds to make seventy pairs of goggles.

The problem of armor is solved, and the problem of offensive weapons is better solved.

Although everyone took a detour at the beginning, trying to use the magic items of the Great Crisis as weapons, it turned out that these things were not something that the students could solve.

Hermione stated that she could get her hands on a batch of guns through her father, and the other Muggle-born wizards in the group were eye-catching.

In the end, Hermione's idea of destroying the painting style was pressed down by Zhang Xu, who was in a cold sweat.

Others don't know the skin of the basilisk, he knows. When he wanted to peel the skin, it took a lot of effort but he didn't make it. When he used a syringe to extract bile, venom, and snake blood, it took a lot of effort for the special needle to penetrate it.

For such a snakeskin, the power of the pistol bullet is not enough, but there is a risk of ricocheting others by mistake. Even if the pistol can break through the defense, it is still a question of how much the pistol bullets stop the basilisk. Zhang Xu saw the cow in the countryside go crazy when he was a child, and the police of the police station hit the mad cow several times in the 54 type, but it didn't hit the vital point, and the injured mad cow became even more crazy, and in the end, it was Zhang Xu's grandfather who made a move to stun the mad cow. As for the Desert Eagle, the recoil was enough to smash the hands of an untrained student after a single shot.

If it's an automatic rifle, the power is enough, but asking Mr. Granger to get a batch of automatic rifles is not only wrong in the art style, but also dangerous for Mr. Granger.

In the end, Zhang Xu could only point to the line in the book, "The basilisk will only run for its life when it hears the rooster's crow, because the rooster's crow is also fatal to it", and twisted everyone's thoughts back.

The crowing of a rooster is simpler, and there are a lot of students who can conjure a rooster with Transfiguration in Hogwarts. And anyone can get a magic item that can be recorded. And there is also a big killer in Hogwarts Castle, a cable broadcasting system. If the rooster's crow is played throughout the castle through the loudspeakers in the castle, you can basically win lying down.

Then Zhang Xu worked with everyone to study the early warning system.

In the end, the early warning system chose the most practical option.

Next to the loudspeaker in the hallway, put a cage with guinea pigs inside. Then set up the magic, and when the caged mouse loses its life because of the sight of the basilisk's eyes, the loudspeaker starts playing the rooster's crow. Mouse mouses, on the other hand, can usually be raised by Hogwarts house elves.

The student council president approached Dumbledore again with this plan, and after a bit of fooling around, he returned with the funds.

Just tonight, the Weasley twins are going to take the house-elves to install the early warning system.

After greeting the twins, Zhang Xu stepped aside and watched as the other group members were discussing tactics on how to deal with the basilisk.

During this time, everyone organized a team of about 60 people with the members of the "Tea Time After School" as the backbone to deal with emergencies about the basilisk. Examples include covering the retreat of students, defending for reinforcements, and concentrating on destroying the basilisk.

When the team was first formed, everyone only selected students above the fourth grade and formed a group of 50 people, and only Zhang Xu was below the third grade in the entire group.

Later, on the grounds that the spirit of Hogwarts needs to be passed on from generation to generation, Zhang Xu tried his best to bring in more than a dozen junior students from four houses, including Harry's trio, in the name of the support team.

Although others were puzzled, they finally agreed to Zhang Xu's approach.

At that time, Zhang Xu thought in his heart, if he didn't bring Harry Potter to play together, these people would be found by Dumbledore to drink tea and talk tomorrow.

After listening to the discussion of the group members for a while, Zhang Xu saw that the time was almost up, so he found Hermione and took her to the kitchen.