need help for rule but cant find it

[Niner]

Originally Posted by kdf5

I wondered if that was the question but wasn't for sure. Years ago some guys from another crew saw us at a bar after a game. They asked about the foul when a player took his helmet off during a down. When asked they said that a B player intercepted a pass in OT and some of the players took their helmets off while he was running the interception back for a TD. They flagged those players for USC. They embarrassed when we told them they shouldn't have let the TD stand.

How long ago was that? Because the ball is dead when B intercepts in OT, but also the USC is a succeeding spot.