yes, he might. It being a first offence might help too. You should think about getting some legal representation for this - someone with a smooth tongue to put the best light on your actions. The fact that it wasn't you who broke his jaw is probably not going to help, but a lawyer would point out to the court how the person responsible isn't even in court. I don't want to give you too much hope (and I'm not sure you deserve it), but it's always worth playing up any positive aspects in your character.