With it being one of the Ill Omens skirmishes for the day, I've now had the troll in the end repeatedly lock onto the skirmish soldier and the twins, pulling him up the hill to the NW of the map and getting stuck up there.

Hunters need some sort of taunt or something that can redirect aggro to make the end of that skirmish more than just a roll of the dice for if you can complete it or not because the invincible troll getting locked on the twins or your soldier tends to mean that it's over at that moment and you either quit or wait for the fail to pop up when he finally gets to murdering the twins...if you're lucky and your skirmisher isn't able to outheal the thing, then it's just stuck there.

Another thing would be to have a longer timer on the things invincibility or rework the damage immunity to still count the damage for gaining aggro as it seems to count anything from an NPC for aggro, but not a player.