Alien- Not the Toes!

Coughlin ran over beneath the alien and fired at it from close range, spattering blood onto the floor, where it hissed and smoked and burned straight through. Coughlin screamed and dropped to the floor, tearing off his left boot.

  The creature leapt up into a laundry duct, and was gone.
…

  On the floor, Coughlin scrambled backward from beneath the duct and tore off a thick sock with a cry of fresh pain. He sat staring at his foot. Bloody, raw stumps were all that remained of his last two toes—the acid had burned right through his boot.

River of Pain, Chapter 19