After catching the enemy, the screen darkened, and a slap in the face didn't ring, and there was a word behind it.

Here's what it says:

P is the first key.

K is the foot key

The standard tactics of instant prison killing are: light P, light P, →, light K, heavy P.

Regarding the use of instant prison killing, I will give you a web page for your reference, which was not discovered by accident.

I hope the answer will satisfy you.