[Gameplay] Twisted Fade's Pick a Card moving through Yasuo "Wall"

Yesterday i was playing Twisted Fate vs a Yasuo. I noticed that sometimes ( not consistently ) my 'Pick a Card' Ability managed to pass through Yasuo's "block ability" ( how's it called again? Sometimes my Blue Card went through, sometimes it got blocked. But it didnt make sense to me how this occured. I picked a card and auto attacked while i auto attacked yasuo threw his wall. Wall was "erected" before my auto attack hit. Therefore i thought it shouldn't hit the minions behind. Yet it did perhaps half of the time.

So Basically Twisted Fate can sometimes stund/bluecard/redcard yasuo even though the card should never hit.

as i do not own yasuo i cannot test this issue right now.