In that state he can be tried as an adult.
My guess is that he will be.
His biggest problem NOW (not then) is if he said ANYTHING, before he saw an attorney.
The attorneys for Law Shield, stress again and again, "Say nothing except 'I want my attorney', until we get there. When we get there, I'm going to tell you the same thing, "say nothing". They have webinars and speak in person at Concealed Carry classes here in Texas. This gets repeated over and over again. Say. Nothing.
The left is looking for exactly this sort of event, either as a trigger for a shooting fight between "us and them", whomever that may be, as a further step toward total anarchy, to be replaced by their own brand of Totalitarianism, or as merely a method of pointing at others as problematical (they are violent {ignoring all their months of violence})
BTW, sending in the National Guard, even if they are from Wisconsin, (or any state affected), as Federal Troops, allows the strident Left to blame Trump some more. Up to that point the Governors had the option themselves (!) to send in the NG, as State troops, and did not.