A rookie who comes into his first practice in rookie camp can be a dangerous thing. They come in relitively cold and are flying around trying to make a good first impression. Some are trying to make the team altogether. In these situations, injuries are always a concern.
That's what happened with Jaguars rookie outside linebacker Dante Fowler Jr who went down in his first minicamp practice and was carted off the field. You can see video of that injury HERE. He was taken at third overall in last week's draft, just ahead of the Raiders selection.