WHAT JUST THE HELL HAPPEN ??????????????????????????
LOOK THAT PICK OF MADNESS RETALIATION:

HOW THAT ZOMBIE APPEAR? I have seen, HE DONT HAVE LIFE!!!!!!!!!!!!!!!!!!!!!!!! IN NOT IN A BATTLE LOLOLOL

I bug it, is easy, use the gun of my heavy is using, zombie clown and target in the same line, life need: 12 or less,

TA-DA, you have your zombie pet :P

Edit: Ps. You lose your pet if quit the room.

Edit2: Look that elevator bug at auditor tower:

I dont remember how to do it. :\