A person is privileged to threaten or intentionally use force against another for the purpose of preventing or terminating what the person reasonably believes to be an unlawful interference with his or her person by such other person. The actor may intentionally use only such force or threat thereof as the actor reasonably believes is necessary to prevent or terminate the interference. The actor may not intentionally use force which is intended or likely to cause death or great bodily harm unless the actor reasonably believes that such force is necessary to prevent imminent death or great bodily harm to himself or herself.
The presumption described in par. (ar) does not apply if any of the following applies:
1. The actor was engaged in a criminal activity or was using his or her dwelling, motor vehicle, or place of business to further a criminal activity at the time.
from section 939.48 here
Wisconsin Legislature: 939.48
so he broke the law by open-carrying a firearm underage, ergo the law protecting right to self-defense does not apply to him
Agreed. there is plenty to unpack here, along with all the evidence of intent they will find in his social media and his phones, which will pretty much negate these bogus "self defense" claims.