if i was a marine i would be running away from this guy i mean cum on look at him . man the crazy thing about the flood is when u hit them and knock them down believe me dont turn yo back away from it . those thing can get rite back up . the best thing u should do is throw a sticky gernade on the big fat ones so when they pop the little puff balls wont get out . just kill them first the go for the humenoid aliens and they wont get back up then. and my number one rule is if u want yo teamates through out the level don let any of the flood get close to them.