The 49ers were down by a point, facing a fourth-and-2 from their own 33-yard line, and had 39 seconds left to play.
Jimmy Garoppolo threw a 2-yard pass to George Kittle, who was streaking across the line of scrimmage and Kittle easily stepped away from a diving C.J. Gardner-Johnson, breaking into the open field.
Safety Marcus Williams, knowing Kittle was closing in on field-goal range, simply grabbed on to the enormous tight end’s face mask and started to furiously.
Kittle protected the ball and managed to carry Williams — still holding on for dear life — more than 15 yards before finally going to the turf (thanks to two other Saints defenders catching up to the action).
The 39-yard play, combined with the 15-yard penalty assessed on Williams, set up a field goal that win the game 48-46, ending one of the most entertaining games of the year and giving the Niners an NFC-best record of 11-2, dropping the Saints to 10-3: