I'm pretty sure this feat is bugged. I have saved all 9 cubs several times. No, I didn't use any AOE's. No, I didnt let the lady baddies kill them. No, I didn't acctidently kill a cub by mistake. I used pryo and horrific vision (from mental set) to single target everything in the room and pulled one by one. Confimation by green name would be great if indeed this is the case.