Is anyone else having this weird bug? It seems that when I kill an enemy, on occasion, they'll kinda get to their knees, and then get back up again with full HP. Is this some spell that the game hasn't intuited showing me, or is it just a weird bug?

This happened to me, and I know what it was. I don't know if this was the case for you, but maybe.

What happened was, the enemy died, but I had a friendly spellcaster near me. He revived the enemy as it died, right away, so it looks like he just got up the second he died. Then, I attacked it, because I thought it was still an enemy, but it was just a spawn from a nearby friendly. It made it go evil, but I couldn't damage it for some reason. It also didn't make the summoner evil towards me, he was still friendly. The only thing I could do was run the fuck away.