I'm not sure if anyone else experienced that but it seems these guys have a habit of randomly resetting every once in a while. I tried to solo a few of them and several times when I got them to rather low health they just randomly went back up to 100%, which is f...fricking annoying because it takes forever to solo them.
Now before this gets brought up I am aware they're supposed to be group fights but to the best of my knowledge there is no rule against trying to solo them, which I personally find fun, but incredibly frustrating when something like that happens. Does anyone know if there's some sort of a timer/reset if you're not in a group or it's just a bug or something?