We had a play similar to this (from an enforcement perspective) a few years ago. With :10 in half and A on A's 30, the following occurred (score 0-0) :
(1) A1 throws a pass, B1 intercepts @ 50;
(2) on the return, B2 blocks in back @ A's 30;
(3) B1 is tackled @ A's 15, followed by A2's late hit;
(4) clock read 0:00;
(5) I went to both captains and suggested we journey over to A's coach;
(6) I explained to him that he could accept B's penalty AND then we would enforce his team's dead ball foul. They would result in B having an untimed down at his 25. If he declined their penalty, the half would end BUT his penalty would be enforced on the 2nd half kickoff.
(7) He told his captain to choose to end the half.
(8) B's captain didn't want to end the half.
(9) I told him we don't always get what we want.
......AND THE BAND PLAYED ON....