This is by no means a pro tip... Valks would sometimes require single target stuns depending on the raid groups dps, which are longer than the 3 seconds of holy wraths. Also, having 4 ret paladins holy wrath at the same time would be a great way to DR the valks. Casting wings on bone storm seems like a very stupid tip, as it prevents the usage of a Divine Protection, which could often save you from a sticky situation during storm. Also, it is best for your rets to wings near the start of the encounter, when you have your trinket/ring procs aligned.