Tumbling/traveling

[Amesman]

Looking for some advice on better sorting out when to whistle for traveling and when it's OK regarding a player going to the ground "with" the ball. Had a partner tell me he would have called one a travel Friday night, but then again, this was a guy who called a couple of fouls in the lane from the backcourt FT line when he was trail (2-whistle) and apparently tired of moving.

But he might have been right about the incident I refer to.

Loose ball rebound gets tipped several times until A1 sort of dives to corral it at the free throw line extended, near the sideline. I believe he went horizontal to grab it and granted him a TO while he was down, as he was getting converged on by defenders. (Turning over while on the ground was not at issue here.)

The catch: He might have first touched the ball by lurching at it with a wild dribble or two before diving after his "fumble" to gain full control. Does that matter?

It seems I get a play ever now and then when a youngster finally gets a loose rebound from a wild scrum while on the way to the ground (i.e. not receiving it fully standing up and tumbling, or then putting a knee to the ground). What's the judgment with this? It seems interpreting what's a fumble situation is key. Is it?

For me, this has become like one of those bad spelling words where I forget if I'm remembering how to spell it or NOT to spell it. Thanks.