"I'm stupid, really." Zhang Xu raised his unsparkling eyes and continued, "I know that Animagus can have more long tails and change the color of his coat when he is practiced to a high depth. I also know that she has a deep understanding of the pseudo-fire charm, and can attach flames to her body when she transforms into Animagus. But I didn't expect her to accidentally go mad when she used the magic together......" He whimpered, unable to utter a sentence.

On the rooftop of one of the towers of Hogwarts Castle, Zhang Xu sat on the ground against the wall on the rooftop.

Scarlet sat next to Zhang Xu, hugged his knees, and looked at the sky in a daze.

If she hadn't caught Professor McGonagall, who was going to Madam Pomfrey for help, it wouldn't have happened.

If it weren't for the fact that she opened the bed curtain when Zhang Xu was about to use the transformation technique to turn into a small animal and run away, waking up Professor McGonagall, who was going to pretend to be asleep, things would not have come to this point.

Fortunately, today is the last day of the Christmas holiday, and the students who took the train back to school have just arrived at the train station, and the few students who stayed in the dormitory are still nested in the dormitory waiting for dinner, so except for the three parties, the others do not know what happened.

After the Christmas break, Hogwarts returned to its former activity.

After using the food additives provided by Zhang Xu, the Dementors found that the effect was actually good, so they assured Dumbledore that they would not enter the Hogwarts walls even one step further. This is what Zhang Xu said when he traded with the Dementors.

Thanks to this, the ban on outdoor activities at Hogwarts was relaxed.

On the first weekend after the holiday, a group of students came to the snow castle and started a snowball fight for the first time in a long time.

Zhang Xu's new game was very popular, everyone set aside a large area for students to hurt each other with snowballs, and the last one who survived was the winner, and the prize was a honey-glazed roast chicken.

Because the weekend was so much fun, the students were a little overwhelmed by the class on Monday.

In the faculty lounge, Lupin, who was resting after lunch, was preparing for the afternoon class, when the door of the lounge opened, and a head probe came in and looked around, relieved, and then the whole person went into the lounge.

Lupin laughed out loud when he saw the sneaky Zhang Xu.

"Zhang, are you still hiding from Professor McGonagall?" Lupin laughed.

"Zhang, why did you and Hellethon make Professor McGonagall angry? I've worked with her for so many years, and it's the first time I've seen her so angry. Professor Sprout asked.

"You and Halleyson must have conspired to take the position of Headmaster of Hogwarts, as the students said, and let Professor McGonagall find out." Professor Flitwick said with a smile as well.

At this moment, Zhang Xu experienced Kong Yiji's treatment when he was drinking in the hotel.

Zhang Xu waved his hand, saying that he didn't want to take their words, and some things should be rotten in the long river of history.

"Professor Lupin, do you have time tonight? There's something I'd like to ask. Zhang Xu sat down next to Lu Ping and asked.

"Well, no problem." Lupin thought for a moment and replied.

At eight o'clock in the evening, Lupin, who was invited by Zhang Xu to the Muggle Studies professor's office, was a little surprised when he saw Scarlet.

Soon, Zhang Xu told Lu Ping about what he wanted to ask.

"Professor Lupin, I know you're pretty good at crafting magical items." Zhang Xu pointed to the map of the living spot on the table as he spoke, "Professor Scarlet and I want to make a portable Animagus detector, and we want to ask you for help." ”

Lupin's first instinct was that they knew that Blake was an unregistered Animagus, so they had to do this probe to catch Blake.

In the next second, Lupin dispelled this thought. Because he thought of the fact that some time ago, Zhang Xu and Scarlett didn't know why Professor McGonagall was angry, and Zhang Xu fed Professor McGonagall, who had turned into a piebald cat, to dried fish in the first Transfiguration class.

So Lupin thinks he's guessed the truth, and he guesses that Zhang Xu and Scarlett have fed Professor McGonagall dried fish again.

Lupin, who forced a smile, agreed to Zhang Xu's request, saying that he could study the Animagus probe with them.

Next, Zhang Xu and Scarlett introduced the design ideas of the detector to Lupin, as well as the current problems.

Lupin's level of making magic items is indeed not low, and the map of the living spot that he made with a few friends when he was a student is a must.

Zhang Xu has done research on the live point map, and found that there are a lot of magic used on it, not to mention the simple background map appearance, the tracking spell on it is a high-end spell, and it also involves the relationship between the name and the magic.

What interests Zhang Xu the most is that the four of Lupin even injected a little of their own thoughts into it. Prior to this, another magical item in Hogwarts that had a mind was the Sorting Hat.

You know, if this technology is used well, it can be used as artificial intelligence in the future.

And the live map actually has an administrator function, and Lupin blocked Snape from the beginning.

Recently, Zhang Xu also discovered that the Living Spot Map has recently been tricked, and Peter Pettigrew's name will be automatically replaced with "Spotted". This explains why, for so long, the Weasley twins didn't notice that their six babies slept with a man named Peter Pettigrew every night, and later Lupin, who was also an administrator, could see Peter Pettigrew when using it.

If Peter Pettigrew knew that his twin brother had obtained the live map, and then found an opportunity to quietly adjust the settings of the live map, it would all make sense.

Zhang Xu has a foundation in alchemy, and he has the experience of discussing with Tonya a while ago to improve the Horcrux detector, and his performance impressed Lupin.

The three of them discussed in the office for more than two hours, and finally finalized the preliminary design of the Animagus probe, and the rest was relatively difficult work and hands-on parts.

After finishing tonight's research, everyone left the office together.

On the way, Zhang Xu asked Lupin about Harry's learning of the Patronus Charm.

"You know, Harry didn't study well at first, his past experience was just terrible." Lupin said, "But he's getting better lately, and he'll soon be able to master the spell." ”

"That's fine, otherwise if the Dementors break into the campus without keeping their promises, Harry will have to be blown away by the wind again. I don't want to win Saturday's race and be told that we won it with Dementors. Zhang Xu said.

"How's your Patronus Charm doing?" Lupin asked.

When Zhang Xu suggested that Harry go to Lupin to learn the Patronus Charm, he was on the sidelines, but he learned much faster than Harry. After all, he had experienced a lot of happy things, and "frying raw as soon as it came out of Missouri" would make a cloud of silver-white smoke burst out of the tip of his wand.

"It's okay," Zhang Xu replied, "I can let them do a little simple action." ”