The Avagadro spawned and I went in the teleporter to Pack a Punch, when I came back with a Rampart with Thunder Wall, I shot at a crowd of zombies with the it and when Thunder Wall did it's effect, the Avagadro got knocked down. His body then remained laying there on the ground while a sort of 'ghost' Avagandro still followed me around, except it was invisible. I'm not sure if I can kill it because I don't know where he is, but I can still bump into him.


Edit: I killed him by knifing the air, knifing his body had no effect, but he was still attacking me and his body was still there even after he gave me the Max Ammo. Zombie came behind me and killed me. lol