[GAMEPLAY] Quinn's Vault and Flash/Gap-Closers
If Quinn uses her vault on someone who uses a gap-closer immediately after, Quinn will usually bounce back in a different direction from where she vaulted from, often somewhere behind the champion or off to the side. The most recent instance where I've experienced this was in my last game, where I was chasing a Soraka towards her tower and vaulted in an attempt to kill her. She flashed in the direction of her tower and instead of hitting her and bouncing back to a safe range, the game put me behind her directly under the tower - the complete opposite of where I wanted or expected to be.
This can be easily replicated by using vault on someone and having that person flash before the interrupt. While this can be beneficial as well as harmful - different instances might place Quinn either in further danger or in a better position to catch the target - it is counter-intuitive to anyone who is familiar with the skill and places, and can be completely unpredictable and unavoidable