Is quinns vault supposed to cancel channels?

Any champion that needs to channel something. Displacements cancel channels.

What he said. Anything with a channel or cast time. Lots of abilities have cast times that are so short they look instant though.

{quoted}

What other champions would be affected by this

The best one I've personally used is against a Lucian who thought he'd use his ult to win a duel. He wasn't expecting to be knocked out of his ult or the burst damage that followed with a blind as he dashed then flashed to his turret. Good times :')

Ya I saw the other guys mention it but didn't bother correcting myself since I was already quoted.