Pvt. Drake: Mark Drake is one of two Bravo Team members using the M56 Smartgun, a portable, high-powered machine gun unit. Ordered to deactivate his weapon near the reactor, Drake's disobedience likely saves lives.
Extra-Damaged Alien: In addition to their ferocious teeth and claws, xenomorphs have a back-up defense mechanism - their acid blood. If one is injured, whoever injured it is liable to be seriously injured by the spray.