User blog comment:Heroduderox/Theoretical Braum Comp/@comment-5663427-20140423062525/@comment-6486964-20140423115806

You realise that if you would be able to cancel vi's ult that would be giving you pretty much a short cooldown engage with the loss of some damage. if you time the cancel right you could jump into the enemy team and go to town dropping your cooldown to a point of being able to use it twice in a fight.

plus vi is pretty broken as is and has only lost popularity because feral flame is really strong.