AR 9-4-1-II gives me the result. Safety. Fine...
I'm trying to find something in the rules that support that.
9-1-4-Penalty gives me no enforcement spot so we go 3-and-1, and we have PSK enforcement.
2-25-11 tells me if the kick ends in B's end zone, then PSK is B-20. So we should enforce 10 yards from B-20 and give A the ball (

)
Where in the rules does it say safety?