Continue play or not?

[dumbref]

With 0:08.6 seconds remaining in the fourth period; B leads A 20 -17; A’s ball at the 50 yard line and the clock starts with the snap. A1 completes a pass to A2 who is tackled in the field of play near the sideline at B’s 30 yard line. The linesman winds the clock to indicate the player was tackled in bounds, makes the spot, then stops the clock for an officials time-out to reset the chains – the clock reads 0:00. The back judge is in the side zone and observes there was 0:01.5 seconds remaining when the play ended but before the linesman could stop the clock.

1. Should 0:01.5 be put on the clock and allow A the possibility to kick a field goal or should the covering official’s normal mechanics allow the game to end?
2. Had the play ended out of bounds, would there be any difference?
3. If B’s head coach was requesting a time out after the play ended with 0:01.5?

Opinions are fine - but if any can direct me to a case play or comment, it would be appreciated.