Well what else can you do? Try and beat the dungeon without a tank? How did that work? It's going to be a bad situation either way, it would have been smarter to suck that time up as a loss and start over, rather than hoping he'd come to, or hoping that you could finish without a tank. My $0.02 anyways.

We really do need a /kick option though. While we know that, too, will be misused, it would still do more good than harm.