You make the call

[WhistlesAndStripes]

First half. Boys varsity. NFHS rules.

A1 is shooting two free throws after being fouled. Attempts are being made at the end of the floor in front of B's bench. B1 goes over by the bench and someone hands him a water bottle. After the second FT, which A1 makes, B2 grabs the ball and takes it OOB for the throw-in. He throws it to B1, who catches it 1 handed while still holding the water bottle. B1 tosses the water bottle to one of his teammates on the bench.

What call, if any, do you make?

Please cite rule and/or casebook references to support your answer. I'm sure we will be discussing this play at our local association meeting on Monday night as it occurred during a game I was working earlier today.