You must know that after He Qi is trapped in which position, when he can't get out, He Qi will choose to suddenly appear in front of him, so that he can turn the corner or kill the other party.

Obviously, the other party chose the second option and killed He Qi.

He Qi opened the double magnification mirror and clearly felt that the other party rushed into the smoke. Without hesitation, He Qi fired a bullet at the location he suspected.

It should have missed, but He Qi was not discouraged.

However, at this time, He Qi saw two small black dots from the sky, and these two small black dots came out of the smoke, and then rushed to He Qi's location one after the other.

“fireinthehole！” He Qi shouted, and in a hurry, he actually used CS technical terms to express the current dangerous situation.

It's a standard warning that is used in many countries around the world, and of course these countries are basically English-speaking countries.

It originally originated with miners, and when an explosive was placed, it was used by miners to warn their colleagues that there was explosives nearby and that they were ready to explode.

This phrase was later adopted by the U.S. Army and Marine Corps to tell others that grenades or explosive packets had been thrown into a bunker or tunnel. It is not used in all explosions that are thrown in an open area and this warning is not used.

But in CS Counter-Strike, this sentence has become a line every time someone throws a grenade, and it is precisely because of the game CS that the phrase fireinthehole has become a popular lingua franca in the world. Thus used by CS players in the world, but the meaning is also slightly off.

Instead of a warning to tell others that grenades or explosive packs were being thrown into a bunker or tunnel, the fireinthehole has become a warning to be careful with grenades.

Both Hei and Pony have also played CS, so they both know what He Qi means.

But they were on the top of the building, and there was no way back, and when they were in a hurry, suddenly He Qi jumped off the roof of the upper floor desperately.

When the old black pony saw He Qi jumping, they didn't hesitate anymore, and followed He Qi closely behind, and also jumped down.

At the moment when the three of them jumped, two loud explosions erupted on the roof of the building.

The Fragmentation Grenade is cast of iron with a serrated exterior, which facilitates the production of more shrapnel after an explosion.

It has an internal TNT filler, and the first fragmentation grenades appeared during World War II.

However, due to the shortage of TNT at the beginning of the war, the interior was mostly filled with nitrocellulose complex.

The radius of destruction is 5-10 yards, but shrapnel can kill up to 50 yards. Since it is accepted that the throwing distance is mostly 35-40 yards, the soldier is required to lie down after dropping the bomb until the grenade explodes.

The composition of the fragmentation grenade is mainly composed of three parts: the projectile body, the charge and the fuse. Shells are used to reload explosives, and some grenades can also generate fragments.

Projectile bodies can be made of metal, glass, plastic, or other appropriate materials. The choice of projectile material has a direct impact on the lethality and effective killing distance of the grenade.

Aluminum or plastic projectiles produce much smaller and lighter fragments than steel projectiles, so kinetic energy disappears much faster. On the other hand, aluminium or plastic fragments can cause serious injuries at close range, and it is much more difficult to operate on the injured.

The type of charge determines the purpose of the grenade. The charge of the grenade can be TNT explosives, other types of explosives, tear gas, thermite incendiary agents, white phosphorus and other chemical warfare agents.

A fuse is a mechanical or chemical device that detonates or ignites a charge. Most grenades used today use two main types of fuses: the detonation fuse and the ignition fuse.

The detonation fuse explodes in the body of the projectile to detonate the charge, which is mostly used for anti-personnel grenades; Ignition fuses ignite chemical charges by burning at high temperatures, and are mainly used for chemical grenades.

Regardless of the principle of operation, the fuse of the grenade is activated either in ** or in a delayed manner. For safety reasons, most of the anti-personnel grenades developed after World War II use time-delay fuzes, and some also use combined fuzes, that is, there is a short delay before triggering the fuse before the insurance is released.

However, trigger fuzes still maintain some advantages. For example, the enemy will not be able to dodge or throw back a trigger-fuse grenade, and there will be no danger of rolling back when dropping it uphill. Therefore, this fuse was not completely abandoned.

For the same reason, there is a constant trade-off between security considerations and not giving the enemy time to react when it comes to choosing a short delay. In addition, a short delay makes it easier to explode in the air, maximizing the effective kill radius.

Compared to other weapons, the combat range of the grenade is very short; Moreover, in the case of the same grenade, its range of action also depends on the throwing ability of the individual.

In general, the standard distance thrown by a well-trained soldier is about 30 meters; If you can throw 40 meters, you will be about to break the record.

The effective kill radius of a grenade refers to the radius of the kill zone centered on the explosion point, and the casualty probability in the circular kill zone. Of course, whether the exposed person is standing, kneeling or lying on his stomach, whether he is facing the explosion point or sideways the explosion point, and whether the explosion is in the air or on the ground all have a great impact on the probability of killing.

The accepted standard assessment condition is that the personnel are in a standing position, facing the ground and at a distance of 1 metre. The effective kill radius is usually set at 15 meters.

It may seem a bit on the small side compared to the selected radius of destruction for other infantry weapons, but it may represent the best balance between combat effectiveness and safety considerations. In addition, it should be remembered that shrapnel is still lethal at a distance beyond the effective radius of kill, and this has indeed happened.

The reason why the other party knows that he will die is because he is holding a grenade at this time, the grenade is different from the firearm, although the firearm is not as powerful as the grenade, but it also has its own advantages, that is, fast and convenient.

The grenade needs to pull out the pin, it needs to be aimed, and then thrown out, and because the power of the grenade throwing is the arm of the human body, it is destined to be thrown out of the speed must not be very fast, and then add a few pins, aim, and delivery actions in front of it, and a lot of time will be wasted.

However, the most hateful thing is that the fuse of the grenade generally burns for a long time, which means that even if it completes all the previous actions with the fastest speed, it, that is, the grenade, is not guaranteed to explode immediately when it is thrown at the location, which also provides time for the opponent, that is, the enemy, to escape.

And now, the person who was outflanked by He Qi already had a grenade in his hand that had opened the safety pin, so he had no time to exchange it for the rifle.