Goofs

When the lab technician wakes up when Brooke is controlling the zombie patient he fires his gun into him and unloads the chamber including a few clicks to mean he's out of bullets. Moments later when Brooke breaks free with the help of the lab technician who is now a zombie and whom she is controlling, she grabs his holstered gun and shots him in the head. He had no time to reload therefore the gun should be empty. See more