Prepulling mobs as healer

[SamRF]

And what actually stops a player who wants to punish those, who rush things without communication first, from switching to single-target attacks or removing the tank stance?

It wouldn't matter because damage is negligible in situation I'm talking about and I'd be able to tank as healer. Beside that I'd never understand why you'd switch to single target solely for the reason of "punishing" the healer, seems pretty childish to me.