BS penalty. Int. grounding on Jameis.
The refs did not need to say anything. The game clock was stopped. That answers the question. It was a mistake by Winston. He compounded the mistake by grounding the ball with time left for the Falcons to still have a chance on third down. Either could have cost the Saints the game. The third down play was worse given you could have easily taken an endzone shot or tried to get the first down. Lack of awareness on Winston's part on both.