You should report it to law enforcement. Alternatively you can file a civil claim against them for battery and seek monetary damages.
Your best option is having the State prosecute the claim for you.
Criminal charges in South Dakota are brought by the State's Attorney's Office. You need to report this to local law enforcement so they can investigate and refer the matter to the SAO to review for charges.
You need to report this to your local police or sheriff's station. They will advise.
If this happened in Eagle Butte, you'll need to have an idea of which county this happened, Dewey or Ziebach, or if it happened on the reservation. That will determine which law enforcement agency you should contact.
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