If he hit the backboard, I would have a try, just as I would if he hit the rim, unless it's just a show-off move. If he doesn't touch anything with the ball, I'm with Dan. I have a travel.
Interesting question, and not very well addressed in the rule book.
crew, when I get a chance I 'll post some of the differences in the NBA versus NF and NBA traveling rules. But I can think of a huge difference without even looking! Can you?