During this level, you need to go in and run into the blue streak to make the explosion. In cooperative multi-player mode, it is easier to send one player in to hit the blue thing and the other to stay back in the hallway where Flood spawn in front of his face after the explosion. If you stay back in the hallway and wait for the Flood to appear, try throwing a plasma grenade onto them as soon as they spawn, when the screen is shaking and going blue. The grenade will stay on the Flood and not explode and the Flood will not move. All 10 to 15 of the Flood, and the one with a rocket launcher will totally freeze. Then, if you shoot them, they will explode and disappear.
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