Some people ease into your life with a polite knock and a thank-you-for-having-us fruit basket. Owen Blackthorn came back into mine wielding a crowbar and a wet-vac. That’s how he became part of Backcountry Mystic, whether he meant to or not. To be fair, he wasn’t exactly planning to move in. Not at first. But if you’ve ever had to help your adult son and his long-time partner evacuate their mold-riddled basement apartment after a freak flood turned their IKEA futon into a floating sponge, you know how these things escalate. One minute you’re offering them a guest room “just for a week,” and the next, you’re stepping over his…