During the game between the San Francisco 49ers and the New York Giants, Niners left tackle Trent Williams appeared to throw a right-handed punch to the facemask of Giants defensive tackle A'Shawn Robinson. The scuffle drew penalty flags for unnecessary roughness on both players, but the NFL could not confirm if Williams threw a closed-fist punch.

• The scuffle between Trent Williams and A'Shawn Robinson drew penalty flags for unnecessary roughness.
• The NFL could not confirm if Trent Williams threw a closed-fist punch.
• Officials review video footage to determine the level of flagrancy in a punch.
• Trent Williams and A'Shawn Robinson have played against each other multiple times in the past three years.