Directed by: Paul W.S. Anderson
Starring: Milla Jovovich, Ali Larter, Kim Coates, Wentworth Miller
Visible crew/equipment: When Chris is released, he stands in the doorway and says "I wondered how long it would take." When he does a boom arm can be seen moving in the glass to screen left. (00:49:20)
Visible crew/equipment: Immediately after the scene of The Executioner beginning his walk to the prison, there is an aerial shot moving toward the prison in which the camera plane's shadow can be seen on the right of the screen. (00:45:20)
Continuity mistake: When Luther ducks to avoid getting hit by Alice's plane, his gun falls out of his pants. He then picks it up again just before he runs off to clear the roof. But in the shot where Angel runs away, his gun is still lying in the middle of the "E." (00:30:20)
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Answer: Based on the sounds to go with the scene, I'd say it is zombies taking the guards out. However, considering following events it is more likely that Alice and her friends have something to do with it.