There was a person in the left bleachers who videoed quite a bit and uploaded it through storyful.
At around the 2:33 mark in the above video you can see the people in the left half of the left bleachers. I’m pretty sure Cory Comperatore is the guy I’ve circled. I’m afraid this is at least a couple minutes before shots start though.
There is boy that might possibly Ronny Jackson’s nephew, about 5 rows in front of Cory Competore. He’s about 15, with brown hair, wearing a red and white striped polo shirt. He doesn’t seem act like he’s aware of any injuries, though.