Originally Posted by
DarthMonk79
If doing invasions it could have been something as simple as you healing him drew the attention of a "named" demon and it destroyed him. Or you ran past him with the aggro of a demon and it did some attack that got him caught in the crossfire. Other than that I can't really think of one unless he had some weird debuff on him from a demon that hurt him if he got healed or got a good buff from someone. I know there's one that does more damage the more a player moves, if you gave him a speed increase buff that probably did it