Travel on A followed by illegal contact by B.

Lead made the right call since he's looking for contact. Trail decided to pass on the travel for whatever reason....

But is the defender staying within his vertical space?

That's the $1 million question. Full speed, the defender has established his spot on the floor. In slow mo he is sliding a bit, but I would have a hard time rewarding a whirling durbish, out of control move like that with free throws. Otherwise any crash test dummy can barrel down the lane and draw a foul any time he wants. I'm obviously in the minority here though.

Out of control? Are you kidding? These are Division 1 athletes. That's just a good move to the basket. I wouldn't even consider that out of control in a HS varsity game.

The travel was missed, but this was an easy, easy foul -- the defender brought his arms down and didn't stay in his vertical space.

OK, but what about the defender's arms? I would not say those are within his own vertical space.

I think his arms are vertical. However, the endline look clearly shows his upper body leaning forward out of his vertical ... FOUL.

To me, the arms are a non-issue. I have B's body/torso moving forward at the time of contact, which is before arm contact.

That's what I saw in the very first replay, full speed.

They may be vertical with his body, but leaning forward like that they're not perpendicular to the ground, that's for sure.