Defeating the shagohod is probably the most fun part of the whole game. Quickly shoot the treads (Wheels for those of you you who have bad vocab.) Then Volgin will complain about how he can't move or saying "What have you done!" Eva will drive around to the back of the shagohod and shoot the part that is smoking it takes about one-fifthe of the machines life. If you don't inflict damage it propbably means you didn't do it fast enough.