More likely he would be prosecuted for violating the civil rights of the shooter. That said, even in Idaho we can't carry on a K-12 campus. Until that law is changed, you're just stuck on stupid if you carry in a designated prohibited zone.
Ah, but an un-Constitutional law IS VOID. So we carry to our hearts content in liberal demented mecca “gun free zones” — for the safety of ourselves and young innocent ones, while others who choose to live on their knees foregoing their inherent right to self defense become victims.
And let us not forget the 11th commandment, thou shall not get caught. In this case, that means to avoid a search of one’s person, by any means necessary.