Cam Newton had every reason to smile Sunday after leading the Patriots to a win over the Miami Dolphins in his New England debut.
Instead, the Patriots quarterback was heated after the final whistle, getting into it with Dolphins linebackers (and former Patriots) Kyle Van Noy and Elandon Roberts in a tense sequence.
As NFL Media's Mike Giardi observed, Newton may have been set off by Van Noy bumping him on the final play of New England's 21-11 victory.
Newton then exchanged words with Roberts before the two had to be separated by their teammates. The 31-year-old continued to jaw at Dolphins players as his Patriots teammates tried to get him off the field.
Newton also may have been irked by a Dolphins player who appeared to snatch the QB's chain from his neck during the fracas.
A more concerning development for Patriots fans is that Newton appeared grab his left hamstring as he made his way toward New England's locker room.
Newton is set to speak to reporters after the game, so perhaps he'll shed some light on what went down here.
UPDATE (5:15 p.m. ET): Newton indeed addressed the incident in his postgame press conference, claiming the Dolphins tried to snatch his chain.
Check out what he had to say here.