[Gameplay] Knocked back during Vi ultimate.

If a knock back, (In my case, Syndra's) is cast just before the actual Knock-up animation occurs, Vi is knocked back. This leads to her being effectively stunned, as she finishes the animation and the target is knocked up. Vi then finishes out of melee range and suffers for it. This issue is common and repeatable, I've known about it for a while but didn't think much of it until a Syndra used it several times when I ulted her. I know Vayne has also done it to me before, but I don't tend to ult Alistars or Maokais to know if they can repeat it as well.

I don't have video, I don't record my games. To repeat it though;

1. Vi Ult onto Syndra from a fair range.
2. Syndra cast "Scatter the Weak" on Vi just before the ult makes contact.
3. Vi is knocked back and locked in Animation while Syndra is knocked up.