My prediction is they get charged with Aggravated Assault & Battery due to the extent of the injuries inflicted. Will be looking at up to 5 years in prison and/or a fine. Probably end up pleading down but that will be up to the DA. This has gotten very public and the video is pretty graphic. A DA might see no reason to take a plea.
Here's the statute. I've highlighted the relevant parts.
§21-646. Aggravated assault and battery defined. A. An assault and battery becomes aggravated when committed under any of the following circumstances: Oklahoma Statutes - Title 21. Crimes and Punishments Page 165 1. When great bodily injury is inflicted upon the person assaulted; or 2. When committed by a person of robust health or strength upon one who is aged, decrepit, or incapacitated, as defined in Section 641 of this title. B. For purposes of this section “great bodily injury” means bone fracture, protracted and obvious disfigurement, protracted loss or impairment of the function of a body part, organ or mental faculty, or substantial risk of death.
Also, below is the self-defense statute.
§21-643. Force against another not unlawful, when - Self-defense - Defense of property.
3. When committed either by the person about to be injured, or by any other person in such person's aid or defense, in preventing or attempting to prevent an offense against such person, or any trespass or other unlawful interference with real or personal property in such person's lawful possession; provided the force or violence used is not more than sufficient to prevent such offense;