A couple of guns I have noticed their abilities don't work on harpies. When using bad juju killing harpies, the string of curses ability doesn't work. This is really annoying because I have to manually reload, and whenever I don't have to manually reload, the bad juju has infinite ammo. Also the fatebringer's abilities don't work on harpies either. When I kill a harpy with a crit-hit it doesn't explode, and I can't do that faster reload from getting the crit-shot kill. I don't know if this is a bug or intentional... but it doesn't really make sense that you'd have one enemy that weapon kill abilities don't work on...