K1 may block anyone unless it is KCI, which would mean he would have to block R1. Since he is blocking R2 it is not an illegal block. Although I think you will rarely see K blocking on a scrimmage kick as they are the ones attempting to make the tackle. There is a good article on grantsrc's website that talks about blocking as "dancing" and how to determine who is "leading" the dance in order to judge forced touching.
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