Well I have the xbox version and all i did was run to one side of the cantina and the other didn't follow, I used Atton a lot so it was no problem, actually i just gave him a couple stimulants left the game for like 5 min for so and one of the sisters was still wacking at Atton not hurting him a bit till i killed her off. Anyways ya just try to draw them apart if you can may have just been a glitch for me.