As a healer, it’s too easy to spot a fail group.
Fail group = people are getting randomly 1 shot every other pack, on the boss, the tank is pulling adds onto the boss and pulling the boss with the group at 50% mana and HP on Tyrannical week
Non fail group = people are popping defensive CDs and no one is really dying and the tank is pulling like a sane person and I don’t feel anxiety if I use DPS abilities.
It’s that simple.