I'm sorry to inform you, but you should appear on the summons. If you do not appear, you will automatically be found guilty on the charge, and an arrest warrant may be issued against you. The arrest will be able to executed at any time, and if it is executed you will be immediately taken to jail. On the other hand, if you appear you will be able to present and factual and legal defense you may have, including self defense. Yes, the cost of appearing may be a lot, but the cost of not appearing may be greater. You also have the right to be represented by counsel, and for any criminal charge it a good thing to be represented by counsel.
The summons may have a way for you to plead guilty by mail in which you simply pay a fine. If you are willing to do that to avoid appearing check the summons.
Otherwise, I strongly recommend that you appear on the summons and present whatever defense you have.
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