Literally how?!

Okay, so I recently had a fight with another player on Namalsk.

He started with a heavy hit on me with a knife, and maybe another hit though im not sure.

I ran outside, he ran after me AND I SHOOT HIM TWICE TO THE BODY.

Of course he falls down and goes uncon, but then, HE WAKES UP IN LITERALLY 3 SECONDS, AND KILLS ME WITH A SINGLE KNIFE HIT!

I WAS HALF HEALTH?!!

Literally, how tf did that happen, how did he leave uncon so fast and how did he kill me with full health in 3/4 knife hits.