Minnesota's in field goal range, but they're a touchdown behind New Orleans and there's only a minute left. Tight end drops a pass, so its 2nd and 10. As they head back to the line of scrimmage, Vikes QB Daunte Culpepper sees something he doesn't like and calls a time out with 44 seconds left. Station cuts to commercials.
Five full minutes later, the station comes back to the San Francisco - Green Bay game.
Given that San Fran is more of a local team than Minnesota or New Orleans, I can understand Fox preempting the end of the Vikings game for the 49ers game, but that is not what they did. They preempted the end of the Vikings game *for the commercials*.