Defender hits dribbler's hand; ball goes OOB; Whatcha got?

[Jimgolf]

A1 is dribbling by the sideline. B1 reaches for the ball, doesn't hit the ball, but accidently hits A1's hand, which is in contact with the ball, and the ball goes out of bounds (without hitting anything else other than the floor). Call? Rules reference please?

Please consider 7-2, 7-3 and 4-24-2 in your answer.

I think the correct call by rule is Out of Bounds violation on A1. Am I missing something? BTW, I suspect most would say the ball was hit OOB by B1 and ignore the contact.

Thanks.