Does anyone use macros for the Prophet Tharon'ja fight in Drak'tharon Keep? It's not a particularly difficult fight, but I'd rather be able to accomplish it by hitting a single macro duplicated on each toon, than mousing over to each client and clicking the "steal life" spell. Also, Macaroon doesn't like the possess bar on my tank for some reason, and I can't get it to show, so she currently doesn't contribute to the skeletonized parts of the fight. The trouble I'm having is, a macro like:

/targetexact Prophet Tharon'ja
/cast Steal Life (or whatever it's called; I'm at work right now -- I mean the big purple damage spell)

... isn't working. I've tried it with an /assist on the tank as well (just in case I was misspelling the boss's name or something), but no dice. Is there something special about this fight that requires a different macro setup? Thanks.