Mmm, idk, unless there has been a change since our first week, the 'avoidable' physical damage from hisek is all modified by armour.
My guild has 4 locks soaking aim, so there are times I have to eat whirl, and sometimes when it is really close to hisek spraying his crap - I don't deliberately eat avoidable damage, but I can't say I perfectly avoid while making it to the guy in aim on the far side of hisek during a dance, etc. In DA, you take ~300k from hisek's aoe. Demo leap, and that sort of survival safety net is just really nice for me