Something weird..

Today i saw a glitch which i hadn't seen before. A guy was using EoBot and, naturally, he was speeding a little. He was being hitted by a npc while he was autoing (moving, attacking). The player was ok, the bot didn't crash. The weirdest part was that he was receiving permanent hits (4 HP) from Nutviper. The NPC was standing and hitting a ghost. I moved to that NPC, tried to hit it.. nothing happened! The Nutviper was a ghost. Suddenly, it dissapeared.