I was a supply teacher in Bradford and Halifax for many years. I have faced teenagers who threatened me. The most frightening was a 15 year-old girl who swayed in front of me, high on glue, with open scissors in her hand which she jabbed at me. It's a tough job.
This teacher was obviously facing a very difficult group (only 8 pupils) and I can't understand why he didn't seem to have a teaching assistant in support - I am happy to be corrected if there was one in attendance.
Many pupils break all the rules with their mobile phones, I've wasted much valuable teaching time getting them to turn them off (parents complain if you take them off them) and yet it is essential for sense and order in class. Teachers have to uphold the rules. Clash point!
Just to add that in Bradford the Asian Pakistani population generally hates black people. Most of them (Carribean descent) have moved to Huddersfield, where they have amalgamated in a specific area.
I very much hope that in 11 years the system will enable this 'boy' (old enough to be married under Shariah law) to re-think his views. My admiration goes to the victim and his act of forgiveness.