a dps warrior or druid with a good tank set would probably work though, the buff gives you a ton of health and maybe even armor? and stepping in the beam is instant aggro so it wouldnt be a matter of being able to hold aggro, just survive the phase long enough, 2 healers might be rough for that fight too, be interesting to try though
And a good rogue can kill anyone. I don't care if they are against an "op" warlock or a Prot specced warrior throwing town shield wall and last stand! Rogues > Normal classes.
I love when a rogue tries to kill me in AV heh, run around in full tank gear and pop holy shield and consecration and even stunlocked he kills himself the faster he hits me