Probably double it.
Gaze is the hidden Fury artifact ability. It's a chance on death, with a hidden 15m CD, to summon a Val'kyr which keeps you alive for 10s. If you kill the target which reduced your health to 0% during the time limit you will be healed to 50%, otherwise you will die. Note that you must get the killing blow, and it must be against the target which reduced your health to 0%, not any target.