I don't know about feast but I imagine you can use the same principle. Right now healers are so OP that a burst is rarely enough to 100-0 anyone. I just started getting into brd and I'm starting to figure out what % hp the enemy needs to be to burst them to 0. That being said blms put a bad taste in my mouth. I can get my entire burst off in the time it takes a blm to cast a spell. There have been many a 8v8 where I'll get my burst off just to see the blm's name pop up on the kill. Blms have the power to finish off any attack I initiate.....and I'm supposed to be the sniper =P