The character Vasquez's luck would eventually run out along with the ammunition of her rifle.
Shooting one of the alien creatures dead with her pistol, her leg gets splattered with acid.
Vasquez's luck runs out in the film, however, she hardly falls over;
rather, she claws, crawls and grimaces, blasting Aliens and grappling
with one creature mano a mano before a grenade saves her from a serious
case of indigestion. In the scene, a stuntman in Alien costume was
lowered by a harness onto her from one of the air vents, then promptly
dispatched with a barrage of gunfire into its face.
It was a juicy scene in more ways than one. "I had to get all slimed up," she grimaces. "I think Vasquez is just so angry that it has finally gotten her. Rather than being scared, she's pissed off she's about to die." (Viva Vasquez: Starlog Jenette Goldstein Interview 1987 Copied from https://archive.org/details/starlog_magazine-115)