Your caster cleave has more interrupts than you think. You have mind freeze, pummel, rebuke from the hole pally because i believe it's cata where interrupts don't miss. Wind shear from ele which is the fastest CD for interrupts, I'd it's single target ur lock will be using the felhound and you can macro spell lock on it to use it when you need it if it's on the target, boomkin aoe interrupt, skull bash and the mage interrupt. Some of them may be situational or long CDs but for the most part you have some really reliable kicks. Unless they need to spread the Hpal should be in melee range to Cstrike for quick and mana efficient holy power anyways.
