Could someone explain Graves's E to me?
Taken from the Wiki:
Active: Graves dashes in the target direction, reloading one Shell and gaining bonus armor and magic resistance for 4 seconds, stacking up to 4 times.
「 Bonus Resistances: 10 / 15 / 20 / 25 / 30 」
Each pellet reduces Quickdraw's cooldown by 0.5 seconds upon impact with an enemy. Furthermore, any damage dealt against non-minions will also refresh Quickdraw's bonus resistances.
Quickdraw resets Graves's autoattack timer.
My question is, how does Graves get the stacks? Is it just every time he uses the ability so long as he has remained in combat, or is there some other way for him to stack the resistances?