strange play, didn't know what to call

[rainmaker]

I am trail, A1 inbounding near the division line by the table. A2 come streaking near the sideline, toward the backcourt, very closely guarded by B2. As they get close to us two things happened simultaneously: A1 passed the ball in, and A2's feet and B2's feet got tangled. The ball hit the inbound players bounced away and hit coach B oob, just as A2 and B2 hit the deck. I wwhistled immediately, keeping my hand in the air (flat), and watching to see that the now prone players were okay. Ball was bouncing peacefully inbounds.

I knew something had to be called, but I had no idea what. There was clearly no foul (although A coach didn't see it that way), but I wasn't sure what to do. So I went to my partner and said, qhietly, "Hey, bail me out here, what do I do?" He did. He said, "B tapped the ball oob, give it to A." Coach A wanted a foul, but was at least relieved that he got the ball back. Coach B didn't say a word.

It just felt funny to stop play with the ball bouncing, unattended, inbounds.