Both spawn when Bishop Toluwon dies - we usually move the raid back to the Avhi Escron room once Bishop drops, then get the trash cleared from the 'chapel' room before these 2 are aggro'd. The corpse-camp a LONG time (>5 mins) before they go back to their side rooms, but once they do, they can readily be single-pulled to the other room. We usually lose the puller on this though. :)
if everyone goes into the bishop's cubby right before the bishop dies, there should be no aggroes from nearby mobs... then you can have your bard start pulling the sword fodder
it seems his lifetap is magic based, can anyone confirm if psalms of veeshan from one or two bards lets the tank resist the lifetaps? if so, you only really need a 6-7k warrior for a tank