Pvt. Frost: Ricco Frost was a member of the expedition to LV-426, detecting Newt on the montion tracker and piloting the APC. A veteran Colonial Marine, Frost previously had a close encounter with an Arcturian.
Burning Warrior Alien: Xenomorphs are known for their acid blood, which can cause collateral damage when they are shot. But burning a xeno is not much better, as its high-pressure system can explode under prolonged heat.