No, assuming your account of the situation is factual. You won't be doing any jail time. In fact, you could sue as assault & battery is both a civil and criminal tort. I doubt the other kid who is 19 will do jail time though. Probably several months of probation and if they can find substantial evidence that alcohol was involved then probably motor diversion also. You should contact the police ASAP, you are a minor and the other guy is a 19y/o. They will definately be on your side. JuJitsu or whatever is entirely irrelevant.
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