You and I must have watched the same interview. Here it is: https://www.youtube.com/watch?v=yMf1SApdnb4
At 5:00, the twin brother describes what happened. It doesn't sound like bullying. But it's definitely a case where an altercation escalated within seconds.
The brother says the killer was sitting in their tent. They asked him to move. He "started getting aggressive and talking reckless." The victim "stepped in" and told him he needed to move. The killer dared him to make him move. The victim grabbed the killer's backpack, and the killer stabbed him.
It's not clear who first asked the killer to move. The brother says the victim "stepped in." (Maybe the victim was defending his brother and other people in the tent?)
There's no mention of a video, so the case might depend on witness statements. The defense will probably argue that the killer acted in self-defense. Without a doubt, the defense will make the victim's size and strength an issue, and they will point out that the victim was much bigger than the killer.
But the killer must have been looking for trouble: He brought a knife to a track meet. When he was asked to move from the wrong tent, he flipped out and dared the victim to make him move. When the victim grabbed his backpack, the killer stabbed him.
Within seconds, he took the life of a 17-year-old... over something so stupid.
Karmelo needs to fry, but he will spend minimal time in jail.