QR too fast cancels ult (Katarina)
You can see my inputs from right to left. QWER in that order looks like REWQ.
If you input QR too fast, it will cancel your ult. It seems like its an issue with the cast time of the Q. Kat can ult before the Q dagger comes out, and throwing it cancels her ult.
If you input EW too fast, your W dagger will go off before you shunpo. This happens because of the small cast time on her E. If I wanted to leave my dagger, I would press WE. I feel like this makes her feel clunky. Allow Kat to buffer her W in the small cast time of her E.
, but it is one reason (of many) why I am having trouble.