Hi everybody

Hi, guys. I have returned. I did not play about a month due to fckn hackers. Today I entered to look at a situation. I see a new mode here. This is zombie mode. I played there, but in the end of the game then appeared the biggest green zombie (he looked like a big green mutant) all my team escaped and I stayed alone. WTF? I ran from crowd of fckn zombies and shot them from desert eagle (for some reason I started with M700). They killed me 2 times, but anyway I killed that biggest zombie (boss). I do not understand sense of that mode. But I noticed that one must kill any zombie only by head shot. Please, anybody explain to me what happened. Which way my team disappeared?