If a player bounced the ball behind the three point line hard enough and it went in the basket, you award two points. The "try" ends when the ball hit the floor, but a live ball entered the basket from above.
In this case, there was legally no try, since, by definition, a try has to be made by throwing the ball,or by tapping the ball with the hand(4-40). I would count the basket, and treat as a common foul..ball to the header's team, or free throws if they are in the bonus.... and promise the opposing coach a fax tomorrow with rule references.
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