49ers' Malik Mustapha's Illegal Hit on Seahawks Goes Unflagged

• Malik Mustapha of the 49ers made an illegal hit during a game against the Seahawks.
• If flagged, the hit would have extended Seattle's final drive.
• The NFL often discloses fines to indicate whether officials missed a foul.
• The hit involved lowering the helmet to make forcible contact, a common infraction.
• The incident occurred during a Monday night game.