TY. Being a clicker on Mag isn't all that hard, you just have to be smart enough to know when to click and how to deal with getting bounced around by Quake. Oh, and how not to die. Which is apparently tougher for some than for others. (Tip: As Collapse does physical damage, it will one-shot low health clothies who are unable to shield or otherwise mitigate the damage.) Also, running through Conflagration = bad.
Our method of tanking him is a bit odd: we have him at one edge of the room instead of the center. This makes it practical to assign melee (especially tanks) to cubes, but runs the very real risk of people getting cleaved, especially during Quake. Ah, well, he died, so who's complaining?