We don't by definition (2-2) have a bat here, as A2 is not slapping or striking the ball. However, I know that practice is to treat this as a bat.
9-7-2 says that a pass or fumble in flight can be legally batted ("no player shall bat a loose ball other than a pass or a fumble in flight..."). 9-7-3 says that a pass in flight may be batted in any direction by an eligible receiver unless it is a backwards pass batter forward by the passing team.
So unless there is something I'm missing in the book, this is a legal play. Enforce the UNS for the spike on the try or on the subsequent kickoff per 8-2-5. Unless, as BetweenTheLines says, the B coach picks a UNS foul up arguing the play, in which case they offset.