I'm on the subject of tires here in my little world and got to remembering some of the flat tires and what caused them. My most unusual was after a 50mi ride and that next morning the back tire was flat. All I could find was one nearly invisible "cat-whisker" wire barely protruding into the tire chamber. I have no idea how or where but it was enough to deflate that tire quicker than a Patriot's ball on the sidelines. Sure glad to have made it home. Probably from a radial tire blowout along the side of the road.
I know your story is more unusual than mine. What made it go flat??