Talon and Yasuo bug: wind wall cancels not only talon's ult blades, but also the stealth and ms.

I was playing against an yasuo as talon, which is usually very easy for me, but this time, when I ulted, if 1 of the blades tocuhed his wind wall, it would cancel the whole ult including the stealth and the ms buff. It should only block 1 blade or, since all the blades are from the same ability, it would be A BIT acceptable if it blocked all the blades, but for sure not the stealth and the speed. I'm pretty sure this is a bug, because never happened to me before, and I played against lots of yasuos...