Proper NFHS enforcement of this penalty?

[MJT]

Originally Posted by tskill

What is the proper NFHS enforcement for this case?

Kickoff from K's 40 comes to rest at R's 5 yard line and R1 intentionally kicks the ball through R's end zone. If the penalty for the illegal kick is accepted, what is the resulting penalty enforcement / from where is the ball put into play?

I think this question has found its way to all three boards now. It is a loose ball play cuz the foul was during the kick, (before possession - which would then start a running play), so it has a previous spot enforcement. If accepted, K will rekick from R's 45 yard line. If the penalty is declined, you'd have a touchback.