How many times is one required to be hit in the head with one before self-defense is permitted in The Shire?
The main crux of the prosecution will be to show that he put himself in that situation.
The tenants of self defence do not apply, if one knowingly went looking for trouble.
His stated purpose was to protect property, however, he at some point left the place he was "defending". The reason he left, will now be a key piece of this case.
Last, and to me, key, WTF was he even doing there?
Where were his parents, why did they let him go?
If his parent(s) had kept him home safe, not let him go to wonder around out of state at a riot, none of this would have happened.