Sounds like he learned a lesson through the whole thing. I'm not sure what WWYD question you are asking, but he IS 18, and on his own. He's gonna do stuff. Not much you CAN do about it. From a mom pov, I'd suggest he think things through, and give the police a heads up in situations like that, and mention that those "toy" guns could get him killed if they are mistaken for the real thing.