[GAMEPLAY] Trundle's Bite attacks through Fiora's Blade Waltz

A while back, a Trundle moved forward to try to finish me off while I was moving towards tower. I decided to use Blade Waltz against him to try and survive so I could retreat and Fiora moved towards him. However, the Bite occurred and I was slain mid-waltz even though I was in Blade Waltz at the time and should have been untargetable.

I know that Blade Waltz was active because the initiating sound effect played and I saw the animation. I could not have been hit by Trundle before Fiora used it because Trundle's Bite is Melee Range while Blade Waltz has a range of 400. Further, I know this is a bug and should NOT have been a case of Fiora taking damage from abilities that have already targeted her as Trundle was out of the targeting range of Bite at the time.