I'm missing something: where's the assault?
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First of all I would recommend that you not post specific facts about what happened on a public website because anything that is said could potentially be used against you in court. However, that being said it does not appear that an assault occurred based upon the scenario which was described. In TN, in order to commit an assault you must either cause bodily injury to another person, cause offensive physical contact with another person, or cause another person to "reasonably fear imminent bodily injury." Based on the scenario above there does not appear to have been any bodily injury or offensive physical contact. Also, if the statement was made "come back when you are 18..." (i.e. at a later date), it would not indicate a threat of "imminent" bodily injury, merely the potential for a future altercation.
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I agree with Mr. Bell, don't post specific facts on a public website where anybody can read about them. From what you have posted, it doesn't sound like an assault occurred. If a charge is brought, contact an attorney for a consultation. If you can't afford to hire them, request the public defender.
My answer is for general discussion purposes only. It is not intended to be legal advice regarding your specific situation and does not create an attorney-client relationship.