It probably works (I don't see why it wouldn't). However healing 10% is the same as absorbing 10% (Defile), and the fact that Defile actually does massive AoE helps a lot more (BoS isn't really an AoE spell at all anymore post nerf), plus the 2 min CD of BoS is unwieldy for the fight; you fight the adds for short periods of time approx every 45 seconds, not long periods every 2 mins (which is what BoS does basically).