A North Penn High School student is accused of attacking and seriously injuring another student. 18-year-old Chidubem Eneanya of Scobee Drive in Upper Gwynedd is charged with aggravated assault, recklessly endangering another person and related offenses.  Towamencin Township Police say the two students had been in a heated argument Tuesday in the F-Pod hallway.  As the 17-year-old victim walked away the other student applied a choke hold, and when he released it the unconscious boy fell forward onto the tile floor, losing several teeth and suffering other facial injuries.  He was treated at Abington Memorial Hospital.