Because nobody could warn them against it, the Roamers have decided to see how effectively they can bring down an old skyscraper... after making sure nobody is squatting inside.
He has acquired a coyboy hat from somewhere. "Now I reckon y'all are considerin' knockin' over one of mah buildings. Do ye have yer demolition permits?"
"Well there's only so many of these things. A lot, admittedly, but a finite amount. So, let's record it all for posterity!"
"Be right back!"
A few seconds later, with a grin and some - flickering - a few big cameras, one of those movie lights on a stand, one of those long-stick microphones, and one of those blackboards that go snap appear. It takes a few seconds. And the stranger is now wearing a fedora and dark sunglasses. "A lonely guy like me is allowed to have hobbies, dahling. I raided this place that was, like, mini-hollywood at some point. I forget exactly when."
"I can be both. Do any of you uncultured rabble know anything about cinematography? Oh, sorry, kidding about the rabble part, you seem kinda organized."
"Exactly. I'm going to make a little movie out of this. Do you all want to cooperate so it could be an actiony drama flick instead of a boring documentary? It won't take more than the rest of today."
Mysterious Guy disappears and starts flickering around in an increasing circle looking for extra Miracles. The search pattern is a bit boring, but it gives him time to think.