Yi's alphastrike negating spells cast at him.

Since people love playing Yi, been seeing him a lot lately and have noticed something that is quite broken with him. When casting something at him and he uses alphastrike, it just completely negates it. I play Vi a lot and if I tried using my assault and battery on him and was going towards him, if he used alpha strike I would just stop and my ult would go on cooldown. This affected the game quite a bit as he went through without receiving any damage/cc and I was stuck looking at a 80s+ cooldown. This cannot be right, if it is then its a pretty horrible idea.