What? That is quite hilarious, but we HAVEN'T SEEN it out of the ref's angle. The embellishment makes it hard to judge from pretty much every other angle than this one.
The ref had no angle. They called it after a lot of deliberation and consulting, waaaay after the play was blown dead for the "fight" that followed the situation. None of them saw anything to penalize in the play, but since there was an injury in the play, history has been altered so that Komarov in fact did a flying knee kick straight to Medvedev's arm causing said injury.