Video shows Philadelphia teacher knocked out by student A video circulating widely on social media shows a teacher at a violence-prone Philadelphia high school lying on the ground unconscious moments after being viciously attacked by a student. The incident took place Thursday and it was the third time in a month a student had assaulted a teacher at the city's dangerous Bartram High School. "He told me "get the f--- out of my face," substitute English teacher Pewu Johnson told the NBC affiliate in Philadelphia Friday. Johnson said he had reprimanded the student after he saw a female student sitting on the student's lap in an inappropriate manner. "The boy dropped me down with so much force," Johnson told the station. I was out. Pewu Johnson The video shows Johnson stretched out on the floor in the school's hallway while students look on. The Philadelphia Inquirer reported Saturday that a student posted the video on Vine, a video-sharing service. The newspaper said one student posted a comment on Twitter that said "Old head go put to sleep in Bartram," while others chimed in. Johnson said he would file a criminal complaint against the student, while the Philadelphia School District said in a statement the student was suspended and faces expulsion. The Inquirer said the other attacks put the school on edge. On Oct. 21, a 9th-grader pushed a teacher to the ground twice when the teacher tried to stop the student from snatching her laptop. On Oct. 9, a 12th-grade student punched a teacher in the face when the teacher tried to block another student from leaving the classroom to go watch a fight among students.