Strange NFL play

[rdacav32]

Today in a NFL game, there was an attempt at a fair catch by a receiver. While the ball was in the air, the kickers blocked a second receiver into the receiver attempting to make the fair catch. The block by K obstructed the fair catcher's path to the ball and the ball then struck the second receiver's leg on the fly. The referee explained that once the second receiver was blocked into the fair catcher, it "negated" the fair catch. Does this make any sense? I could understand if the second receiver blocked K into the fair catcher, but that is not what happened. K blocked the second R into the fair catcher. Can somebody explain this one to me?