OMG - how terrified those boys must have been. What they did was wrong, but an innocent prank. This guy is clearly an adult who knows better. His actions are cause for alarm. He threatened with a deadly weapon. It doesn't matter if it was just to scare them or not.
As hard as it will be, I think you need to talk to this couple with all the boys present. Let the boys start off by apologizing and stating it will never happen again. Perhaps if you explain to the couple about your hubby being a retired PO and what could have happened if he had seen this might help.
__________________  Sissy & Angel |