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.
But this is a slight mischaracterization of what took place. Even Jarvis thought he was touched down. Almost everyone on that field (and stadium)thought so, too. Otherwise, why did the refs quickly set the ball in preparation for the offense to hurry and run its next play. The side judges definitely didn’t communicate Jarvis got out of bounds untouched; that’s because he didn’t. Plus, as others have touched on, the second the ball is snapped the game clock is SUPPOSED to immediately begin.

The entire sequence was a mess. I can’t fault Jameis for that, because the refs screwed the pooch on that series. I can, however, fault him for not running the clock down on the next play and spiking on a 3rd down.