Quake 1 - E1M4: The Grisly Grotto - ALL Kills & Secrets - Nightmare Difficulty

Okay, that's weird, one knight in this map is immortal and petrified. No matter how many times I whack him with the axe, he simply won't die. Any such bugs in your game, guys?
This is scrag & ogre town, so many of them here, from start to finish. We also find the exit to the secret level.