Can someone gimme an explanation on this?

how does this works..
Yasuo is broken. I guess..
Server: EUNE Match Details(replay): Type of Bug: in-game Details: Hi there! As title says am pretty confused about what happend to my friend. Not sure if its a bug or an actual game mechanic but... What happend? Any explanations? Can i count this as a bug report? With regards, Kiaro
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