As long as you only maintain 1 UA at a time and refrain from dumping shards into him before he uses karma at 110 WW cant kill u, just avoid getting kicked while specced into essence drain and use curse of weakness when he's in peak damage , you do have a 50% heal with HS if you 're forgetting
Kick = fake cast it.
Stun = trinket the 2nd one, dark pact the first.
Incapacitate= who cares your dots are still ticking.
Shield wall on karma and drain to sustain.
PS: the point of fake casting is to make the opponent use his interrupt without locking you, I don't know what sort of world people are living in thinking they should never fake cast so they dont use it on healer. just fake cast so neither you nor your healer can get interrupted.