Mannice Mitchner was allegedly seen approaching the scene with his cellphone out to record the incident, and prosecutors have accused him of joining the fray.
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A Roxbury teen is facing charges after prosecutors say he filmed a group robbery on the Orange Line earlier this month, eventually joining in and kicking the alleged victim in the head.
Mannice Mitchner, 18, pleaded not guilty Monday to charges of unarmed robbery, assault and battery with a dangerous weapon, and disorderly conduct on a public conveyance. His attorney did not immediately respond to a request for comment…