My first thought goes back to post #1 - - if possible, it might have been prudent for the Pastor in this case to attempt to get his "buddy' the Police Chaplain involved, therefore, taking the onus of "turning the kid over to the authorities" a bit on the sly side, (discrete, if you prefer) to the police, and avoiding the impression of giving this kid up to the authorities, more like "ENLISTING THEIR HELP" in the kid's eyes. Put less of a target on the Pastor and congregation.
As for carrying in church, prudent husbands and fathers protect their families (I gotta add here Mothers, wives, sisters and daughters, too. Not that I'm sexist or anything, but just "equal opportunity") All the time, EVERYWHERE, - - -and there are no "safe spaces" when violators of the laws already have committed to breaking some laws, why would they car about more? And your 380 ACP in the pocket may be all that it needs. How many times have you heard of the perp who ends his attack ( by surrender or otherwise) at the first sign of resistance. Even unarmed resistance?