Damned char limit. Cont...

As a Warrior, you can't really reduce the damage, baring a lucky dodge, but what you CAN do is at least somewhat control your defence against Mountain Buster. You know roughly how much you're going to get hit for, and if you know you wont have that, you can use Inner Beast before Mountain Buster to make sure you're alive coming out the other end. If you know you can survive the hit, you can use Inner Beast after Mountain Buster to give your healers a hand getting you topped off. Every other Mountain Buster you can use Infuriate to heal both before and after. Inner Beast will always heal me for more than a Cure I and sometimes for more than a Cure II, depending on temps and crits.

Spikes are what kills tanks, not continuous damage. Both tanks can control the spikes, but I prefer the Warrior's method. For everything else, that's on your healers.