One thing working in Kyle's favor is the statement that he made prior to him being forced to defend himself.

His purpose for being armed was for self defense as he tends to possible injuries as an EMT. I'm paraphrasing. He also mentioned that he was there to protect a business, which they will use against him if possible. The EMT/EMS service might save his bacon.
I'm surprised that he's already an EMT at 17. It shows where his heart's at.

I'd hate to see him put into a cage , or even paying off legal fees from here on out.