[Gameplay] Kha'zix Ultimate Interrupting Garen's Ultimate (possibly not a bug?)

Skins: Mecha Kha'zix, Standard Garen

Situation: I was Kha'zix, skirmishing with Garen, had Q and E evolved. As Garen ulted me (during animation, before damage) i activated my ultimate, causing me to go invisible. Garen's ult animation stopped, and i took no damage.

Possibly relevant: I was Garen's "Villain" at the time; it's possible that this is intended behavior (to be honest, as a kha'zix main, i hope this is intended behavior)