shoe comes off, stop play or not?

[MJT]

I revised the starting thread after a question or two and to clarify the play, so please re-read it if you have already posted.
Considering it is a varsity game, the team is pushing the ball to get a score, and the ball never became dead, I think you should not stop play. If the ball is dead or the team with the shoe problem has the ball I think you should stop play, but in this case it is like an injured player, which unless the injury looks very serious, you should not stop an opponents push up the floor.