The stabber doesn't look beatup in his mugshot.
And if there was a beating going on, where were the coaches and track meet officials?
No doubt there will be BLM lawyers working to transform this into a righteous self-defense stabbing by a future Johns Hopkins medical student.
As I said, grain of salt. The general feel is the stabber went looking for a fight, found one, was losing, and pulled out a knife.
Not a visible mark on the murderer.