pass/crash

[Troward]

NFHS subvaristy game last night: The ball is stolen by A1 who is penetrating down the lane from the top of the key with a 1 on 2 fastbreak with defender B1 establishing a legal guarding position at the free throw line and B2 retreating towards the opposite block. The play had got the jump on me and I needed to button hook just inside the 3 point line to get a view of the play. Next A1 dribbles the ball off his foot towards defender B2 on the opposite side of the basket and my vision follows the ball to see if it was going to go off B2. B2 avoids the ball and the ball sails OB in a matter of 2 seconds. I whistle for the out bounds and simultaneously I see B1 crashing to the ground and I can only conclude that A1 charged right threw him, but I did not actually see this. My partner was trying to come from the lead at the other end and had not made it to half court yet. What would you call here or do to improve my choices?

thanks
GTW