First and 13 on A's 27. QB A-1 throws a legal forward pass. While the pass is in flight, A-2 illegally contacts a B player on A's 25. The pass is incomplete. What is the result?
If accepted, penalize from A's 25, 1st and 25 on A's 15.
The penalty is enforced at the spot of the foul since the offense fouled behind the basic spot, which is the previous spot (Rule 10-2-2).