Naw, this is not supposed to happen, aggro-management is a group effort, and if the OT war is close to grabbing aggro from the MT, it's the OT's job to not use Butcher's Block, but rather spam the Storms eye Combo repeatedly. Butcher's Block in the OT role should be an exception and really only used in the Offtank role if you are sure you wont steal aggro from the MT. Most top Warriors in good statics with good killtimes use way more storm's eyes than butcher's block, but that information hasnt reached every warrior out there yet.
Everytime their Butcher's block forces a halone from the pld to keep aggro, the WAR gains 20 potency from using Butchers over Storm's Eye and the PLD loses 90 whopping potency having to use rage of halone, which is a raid dps loss and plain selfish.

So yeah, tell your War to watch his aggro bar, and use more Storm's eye instead of Butcher's block if he's close in top aggro.