In the cases of false starts, illegal incomplete forward passes, etc., the act of the foul, itself, actually, by rule, causes the clock to stop. In the case of a facemask foul, the act of the foul, itself, does not cause the clock to stop. In the absence of anything else that would cause the clock to stop, play would continue. Even with the helmet foul, if A1's helmet had not come off, the clock would not stop. It was the fact that BALL CARRIER A1's helmet came off - regardless of why it came off - that caused the clock to stop. Had it been a non-ball carrier, the clock would not have stopped, even as the result of a foul. So, there is not a foul that caused the clock to stop. Thus, there is no option for a 10SS.
Don't get confused by the difference between the act of a foul causing the clock to stop (illegal incomplete passes, and dead-ball fouls while the clock is running), and the COMPLETION of a penalty that causes the clock to stop. A Team A holding foul, with no other reason for the clock to stop, does not , in itself, stop the clock. However, completion of the penalty for that foul stops the clock, and the 10SS does not apply to those situations. The 10SS only applies to those fouls that actually cause the clock to stop the instant the foul occurs.