Solutions to the Tunnel Trainer.

[Emoqq]

Well it would be easy to make an NPC who wont hurt players. You could also set something to summon even at 100% hitpoints, and no, the way this person is training, its not buffing people that causes it, Maybe for some, but any evil race / etc is killed simply for being there. The trainer is targeting them specifically, running up to them, and waiting for the NPC to get kill them right there. After they die, the NPC kills the evil player.