User blog comment:Krauserlols/Is Riven a real Wind Master?/@comment-5331854-20131218112552

Another dimension that can mystify this problem even more:

Was there a witness? If not, then we must assume that the wounds of the Elder resembles those of someone getting hit by a wind technique. If nobody saw the kill, though... could there be a possibility that Zaunite Hextech was included? Given the rather mystical background of Ionia (and the fact that the Zaunite Warmachines were pretty much new for everyone), the Elder could get killed by above-mentioned Zaunite Hextech and it would still make Yasuo look guilty because the wound is similar to the wounds striken by his wind technique. The Ionian just doesn't know it better.

Then, of course, it may be a conspiracy, but that doesn't seem likely.