Unusual play

[letemplay]

Saw this (almost) in college game yesterday: A1 driving in lane with shotclock running down loses control of ball momentarily creating a bit of a scramble. He recovers ball and passes out to far wing area where A2 is spotting up behind 3 pt line. A3 is also coming into area thinking pass might be to him, with defender B1 close behind. Pass gets by both of them and is caught by A2, who immediately rises for jumper attempting to beat clock. Momentum of both A3 and B1 carry them towards the shooter, with B1 appearing to contact A3, thus causing A3 to contact the shooter. What do we have?