Maybe this is one of those situations that the Fed now needs to address...here is one more thought...allthough I do think it should probably be a TB. If the illegal kick is to be treated as a fumble, and a fumble is defined as lost player possesion, it wouldn't be a huge reach to say the kick ended...because as was mentioned above, you can't assume that the fed means a legal kick into the end zone, you can't really assume that the illegal kick is the only kick on the play that says it should be treated as a fumble...I think you could argue these points with a coach and win, and thus keeping R from benefiting from the foul... but in reality I will go with the more popular ruling
Touch Back PSK enforcement