muffed backwards pass into the end zone

[kentref]

Last play of the 2nd quarter last Friday night.

A completes a swing pass near the left sideline to A25 who is running down the left sideline until B13 catches up to him at B's 5 yd line. As A25 is being tackled by B13, he tosses the ball backwards to A40 who is trailing the play. The ball hits B13 in the shoulder pad and bounces forward into the end zone. A40 recovers the ball in B's end zone for a TD.

B's coaches (40 yards away on the opposite sideline) were screaming for a "forward" pitch. Our Back Judge was in perfect position at the goal line and could clearly see that the ball was tossed backwards by A25 before it hit B13.

Had the ball been recovered (in B's end zone) by B13, what would you have had?