Well, we've been farming Heroic Madness for quite a while now but we've never had a warrior tank for it, we've always had a Bear or my Paladin or my Death Knight. Our healers have never had any cooldowns really - Holy Paladin, Resto Shaman and Holy Priest (one who couldn't play disc...). Therefore, we never had healer cooldowns that would help on the repeated tetanus before. However, we never needed them.
We now have a warrior tank and I'm determined to get him to tank it, healers are the same specs and all that. He can survive everything fine but he gets squished on Tetanus. This is even when we are 2 tanking it.
My question is (and I need people who have tested this please, not just theorycrafting and saying "oh it should work!") does Hand of Purity work on the Tetanus damage? Because it would be available for every single time he tanks the adds and we could then let him solo tank this.