OOB, T, or play on?

[ChuckElias]

FED rules, HS Varsity playoff game.

First half, so offenses are playing in front of the opponents' benches.

A1 subs out of the game, and walks to the end of the bench to get a drink. Team B has possession in its frontcourt. A1 is walking back to her seat on the bench. B1 throws an errant pass that is heading OOB. The ball hits A1 on the foot, which is inbounds, and bounces back toward the court.

A1 was inbounds b/c there is not much room on the sidelines. No player for Team B could've made a play on the ball to save it from going OOB.

Ruling?