Hi Tony,
Thanks for the welcome.
I’m no expert, but I don’t think there’s any sort of 3 second rule. I think it has to be a LOT earlier. In fact, Utah’s new player came running in with about 14 seconds left.
I was at the game, but I just replayed it on the DVR with around 13:13 left in the 4th quarter. On 1st and 10, receivers Demari Simpkins #17 and Siaosi Wilson #80 were lined up to the right. A handoff to RB Moss #2 nets 3 yards. It’s now 2nd and 7. As soon as the play ended, the 40-second play clock began counting down.
26 seconds later, with 14 seconds left on the play clock, you see Utah running back Troy McCormick, Jr. #4 running in as an apparent substitution for WR Simpkins #17. Simpkins was already offscreen, so I don’t know exactly when he left, but I don’t think it matters.
The USC coaches reacted to McCormick, Jr. by sending in a defensive substitute. DT Brandon Pili #91 runs in and taps out DT Josh Falu #98.
As required by the rules, the refs hold up the snap until Falu is completely off the field.
The play clock hits 0 and nobody had called time out. So, as I understand it, *somebody* is getting a delay of game penalty. The only question is who.
Unless the refs decided that USC was the culprit for purposely “not completing its substitutions promptly,” then Utah owns the penalty for causing the clock to expire.