The xenomorph skin was quite tough. But it could be penetrated by firearms. Yet the acid blood could eat through metal. So which is stronger, xenomorph skin or the metals the acid blood disintegrated?
Not every firearm. Lt Gorman shot an xenomorph at close range several times with a pistol when he was in vents with Vasquez and the bullets were unable to penetrate it's skin.
"You think that if someone's an underdog, that means they're the good guy. "
