Man, this must be your first time around black people. When black people say "he put his hands on me", they don't mean it in the literal sense. It means the person did something to them physically. Let me point you to the Urban Dictionary
You guys are having trouble imagining any different scenario than what you have in your head. In your scenario of events Metcalf told him to leave and then Anthony told him to touch him and see what happens. Then Metcalf "touches" him and Anthony just wildly stabs him with a knife. However, what if Anthony goes over to the tent to hang out with his friend, whoever EP is in the police report. The Metcalf boys return from the other tent that the dude on youtube said they were in to find this dude in their tent. Metcalf confronts the kid, barking orders at him. They go back and forth, and Metcalf slaps his phone out of his hands. Kids pull out their phones. Metcalf is shoving him or hitting him, all while Anthony is issuing warnings. I am sure Metcalf is saying a few things too, like making threats of his own right? Metcalf might have a couple teammates standing up behind him and then snatches this kid up one final time and Anthony stabs him.
Again, this isn't about digging in. This is what generally happens between teenage boys. All of us here were teenage boys and are pretty familiar with how things escalate in these situations. Regardless of how this case turns out from a legal standpoint, there is no way this was a quick 30 second ordeal and drew the eyes of 30 witnesses and their phones. A bunch of shit happened between the initial "get out" and the stabbing.