Is this a travel?

[jeschmit]

At our association meeting the other day we had this play discussed at our table. I was wanting some clarification, and I figured that this place is the best way to get it!

Here's the sitch: Player has the ball. Hasn't dribbled yet. Hasn't moved either foot off of the floor (he received a pass from his teammate and is standing before moving either foot). He goes up for a shot, and an opponent comes flying at him to attempt to block the shot. Seeing this, the shooter then takes the ball and throws it to the ground to start his dribble. Is this a travel, and if so could someone please give me a citation as I cannot find one anywhere in the books.