A Tiny Thread Perimeter

I was trying to turn around without knocking the brass fastener, but my left tread snagged on a stray strand of blue sewing thread. I panicked and dipped my turret down, worrying I had tangled myself forever. But when I rolled backward one slow click, the thread just looped around the button watchtower and stretched gently toward the leaf woodland. It looked just like a tiny border line drawn along the frontier. I gently nudged the loose fuzzy end flat against the paper with my front fender so it wouldn't blow away.