Our zerker MT seems to think SW is his alternative to Tower of Stone. but stacking SW and both wards pre-pull gives time to get debuffs in, aggro rarely seems to be a problem. There are times when it can work as an 'oh shit' spell too
Maybe when his Guard is levelled up and raid ready I can drop it for curseweaving..... (if you are reading this epi, I never said that, HONEST!!)