Updated

Crosstown rivals Lane Kiffin and Jim Mora stand on different sides in debate about up-tempo offenses in college football.

Kiffin, the Southern California coach, is concerned about the possible safety ramifications of a style of play that crams an extra 20 plays in a 60-minute game.

He says with all the emphasis being put on player safety these it makes sense to at least examine whether up-tempo offenses increase the risk of player injuries.

UCLA's Mora, meanwhile, has embraced "fast-break" football in his first season as a college head coach.

And he says that after being around the game for 30 years, "I don't think there is a safety issue."

UCLA was 13th in the nation, and third in the Pac-12 in plays per game at 81.7 plays per game.