KCI, R blocked into receiver

[don't move]

Had this happen Friday night, I can't find a rule on point, but if feels like we may have missed it. Fair catch signaled for by R1. K2 blocked R2 about 5 yards from R1. R2, as a result of the block, stumbled into R1 just as R1 attempted to catch the punt. R1 muffs, and K recovers. We gave it to K.

I could not find a case on point in the case book or the rule book to support a KCI call.

Thoughts please.