There was a big plot hole in the movie.
[spoiler][b]Tom:[/b] I found out where the alien queen really is!
[b]IB:[/b] Fantastic. Instead of try to outrun all these assholes and risk the possibility of capture and/or you being wounded and getting a blood transfusion to remove the alien power, I'm going to shoot you to reset so we can go WTFPWNZORBBQ the ugly bitch on a fresh go.
[b]Tom:[/b] Don't do that! The odds of that happening are very, very slim
[b]Heavy Power Armor Soldier:[/b] LOL[/spoiler]
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[spoiler]Sort of, I guess. Just remember, in a real battle situation, people make mistakes. Soooo it's completely possible she just didn't get to her gun in time.[/spoiler]