Question about inbounding the ball

[secondyear]

Here is my disclaimer. I believe that this has been discussed before, if so could someone point me to the correct post. If not, what would you call in the following situation.

Player A1 has the ball at their disposal for a throw-in. B1 has their back turned to A1 to guard the basket and not A1. A1 throws the ball onto the court so that it hits B1, then A1 retrieves the ball (after re-establishing themselves inbounds) and scores an easy lay-up.

From the interpretations of the rules, this is a legal throw-in and play. The player threw the ball directly into the court, the ball was touched by another player then the player who threw the ball into the court retrieves the ball. Would any veteran officials call anything? Or would you talk to the player? Or would you not say anything?

Thoughts?

Thanks for you input.