The second mission of Katie Hannon, the one with the 10 spawns, the mobs prioritize killing healers if you let them live that long. Do the same sort of thing. If you set the BAF mobs to do something similar, repel causes every mob in a a large area to bee line to the repeler and kill with extreme prejudice, you could leave their repel working(but just on the mobs in front). Power still works, you just have to live with the consequences. I do like the idea of people using creative out of the box ideas and the devs not breaking them.