In Boss Arena like Frost Beast or Astaroth, mage would stay in Bad area and die. They may blink out of harm way but if that destination is harmful are triggered by room machenic then they don’t know how blink back to safe area. Link they would stay on top of Astaroth pet during revival phase and keep taking damage from it’s red puddle. Or stay in the outer right during Frost Beast blizzard phase where the wind wall would kill the Skeletal Mages.