Have they established how this kid got the gun anyway?
The anti-gunners are going to spin it as a gun was not needed because the gun-man was subdued without guns. Of course, they'll leave out the fact that it could have been far worse and NO ONE should be forced to take the chance that they may be finished off before someone has the chance to subdue or incapacitate an assailant without the use of gun. This is just a fluke. It will also be spun as a way to say all guns should be banned. That's poppycock.
Just because one particular tool is not available does not mean a determined person will not find a way, they will.