Rules Question on strange D1 Ending (Video)

[letemplay]

Was going to start a new thread on this question but it seems closely relevant (rule wise anyways) Saw this play run a few times in a game Sat and opposing coach wanting a T: Baseline OOB throw under A's basket, after A1 makes the throw in, he remains OOB at that spot for several seconds as the ball is passed among his teammates, then he runs to corner to receive a pass, I suppose hoping the defense loses track. Any violation for NOT returning inbounds soon after throw?

EDIT: Sorry, I see I should have read another thread for a more similar play and question.