If he is DPSing, yes. If the tank eat a tank buster, with or without CD, and the healer didn't heal him immediatley because is DPSing, i helaer fault. If the tank isn't use CD, but still have good mitigation and the healer is DPSing, is healer fault.
If the healer is doing his job, and the tank don't use anything ,it is tank fault. I'm not saying ii is always healer fault, because that's not true. I'm saying a healer shouln't DPS if the tank HP drops too much.
I am not talking about tanks forgeting things or gettimg more damage when thay can avoid, I'm talking about a healer DSPing and forgeting heal and blaming tank. Nothing more. Also, CD are not always ready to use.
But in this case, the OP case, it is healer fault.
