[Rune] Precision (Triumph)

Triumph - Restores 12% of your missing health and grant an additional 20 gold.

From my perspective, I've seen this trigger before actual champion deaths. A good example would be that I would be fighting in a game and then either be on my next auto attack or be throwing my ability against the target that would net me the kill, however a heal (without the use of Heal, Item, Buff or another friendly player) would occur from this rune ability before my actual death I would then be attacked by extra auto attack or ability shown on my screen then I would die.