Safety or Not?

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Originally Posted by ODJ

This situation was posed to my group this week:

B33 intercepts A's pass in his end zone and is tackled there. After COP, but before B33 is downed, B45 holds A22 in B's EZ.

Popular response: Touchback. Assess the holding penalty from B's 20. 1/10 for B at B's 10.

Correct answer: Safety.

Can't find a rule reference to support a safety. Assistance, please.

*8.5.2 SITUATION F: B1 intercepts on his own 4-yard line and his momentum takes him into B’s end zone. (a) B1 advances out of the end zone and runs to his own 35-yard line; or (b) B1 runs out of the end zone then circles back into it and in both cases is downed there; or (c) B1 is hit and fumbles and A1 falls on the loose ball in the end zone; or (d) B2 holds A1 in the end zone as B1 is downed there.

RULING: Legal advance in (a). In (b), it is a safety. Once B1 advances out
of the end zone as in (a) or (b), the exception is canceled and action thereafter dictates the result of the play. Touchdown for A in (c). In (d), the foul by B2 occurred in the end zone behind the basic spot resulting in a safety. (7-5-4; 8-2-1; 8-5-2a Exception; 10-4-3; 10-6)