So this was our second week of raiding and we were still not a full raid.
So we went off to Onyxia and cleared it quickly and had a plan to use the onyxia buff on rag once we'd had some dry runs and killed Major Domo.
It seems we didn't need it.
Despite the raid not being full (we were around 34 people) Rag was one shot.
But that's not all! We were very close to killing rag before sons without Onyxia buff.