A court appearance this afternoon for a student charged with assaulting a staff member at a Minneapolis alternative high school for those with severe behavioral or emotional disorders. The victim is in critical condition with head injuries. Prosecutors say 18-year-old Corey Burfield of Saint Paul grabbed the 43-year-old man by the shirt, shoved him into a wall and then to the ground, hitting him numerous times about the head and neck. The alleged attack occurred Tuesday morning at Harrison Education Center.