actionless after halftime ends

[RefLarry]

Team A was to inbound the ball after halftime ends. However,team A walked into the gym and on the court just before play resumed. Their visiting locker room is down two flights of stairs and a long walk from the gym. Play was resumed as subs walked to the bench.

Rule 10 ART. 5…Fail to have all players return to the court at approximately the same time following a time-out or intermission.

I was a spectator.

If team A did not make it to the court on time for their throw-in a techincal would be likely.

Did somebody have the obligation of advising visiting Team A that there was one minute remaining in the half? If so,who has that duty?

Thanks for your replies.