Continuity mistake: Right after Bennett takes off in the plane, Claire throws a gun to Alice. Between the slow-motion shots, the gun switches position in mid-air before Alice catches it. In the shot of Claire throwing it, the barrel is facing to the right, meaning that it should be facing to the left in the shot of Alice catching it. But it still faces the right when she does. (00:58:30)

Resident Evil: Afterlife (2010)
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Directed by: Paul W.S. Anderson
Starring: Milla Jovovich, Ali Larter, Kim Coates, Wentworth Miller
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Trivia: Wentworth Miller's first line in this film is "I know a way out of here." Almost identical to his famous line in Prison Break. (00:40:30)
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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.