Karmelo Anthony must be freed; it doesn’t matter what he did in the past (that’s not what’s on trial, they have no bearing on the case), Austin Metcalf’s past actions are significant because they show Anthony would’ve had reason to fear for his life.
If Anthony’s past actions don’t matter to the confrontation in the case, then neither does Metcalf’s. Anthony and Metcalf went to different schools, Anthony wouldn’t have known about any of his racist actions.