You aren't getting through a training camp without at least one fight. The New Orleans Saints got their first brawl of camp out of the way on Day 2. The main participants were Brandin Cooks and Alontae Taylor. It also sounds like Rejzohn Wright was involved as well.
The Times-Picayune's Matthew Paras posted a video of the interaction once it had already begun, noting Cooks threw a punch. Paras wasn't able to tell who that punch was thrown at. It's unclear what started the situation, but it isn't something that lasted long.
Fights at training camp shouldn't be overblown.