crje
I'm not sure I ever said be forgiving. It was wrong and you should be completely clear that's not acceptable.
All I said was that extending the punishment would be of no benefit to him, but might make you feel more in control of the situation.
Has he been in this situation before? Just picking fights ? Does he do it out of school as well?
You've not said so and I'm guessing he hasn't. Which suggests he has a particular issue with this one lad? And something is triggering it, might be more subtle than you think and probably insignificant to an adult.
Do you know from the school or friends or from him whether this is the case?
Sure, have that conversation about suspension and expulsion from school. Make it clear that he will have to go to a new school, lose all his school friends and probably be isolated in his new school when kids find out he picks fights, or worse get ebaten up by the 'tough kids'.
Talk to him about the more mature behaviour is to ignore this other lad and walk away.
Just don't expect him to react immediately. He might well scream and shout about you being on his case, lecturing him and to leave him alone. That there's nothing wrong, because he's deal with it and in his teenage mind that's it over, he doesn't understand why everyone else is getting so het up about it.
And the part of him that does feel guilty is being shouted down by the part of him that is struggling with his desire to break away from you and his dad and everything you say and all that you stand for. That balance will change over time as he gets more life experience indpendently from you.
You've got 6-8 weeks to wait for... counselling I presume, why not get that book SDTG suggested?
I read 'Get Out of My Life, but first take me and Alex into town', which is along similar lines, and often mentioned in this thread. Armed with the understanding of teenage development, you might well see a different way ahead.
Good luck though!