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I was out on a night time bike ride just now and during the middle of my ride my bike fucked up. When I pedaled, there was no resistance and this cog thing (pic related) freely spins as I pedal without spinning the back tire. It's strange, if I pedal enough, it seems to lock back into place, but if I pedal backwards it comes loose again and spins freely again until I pedal forward a few cycles again to lock it. Any idea what's wrong and how I can fix it?
It's too dark in the garage to fuss with it right now, so I figured I should ask now and then fix it tomorrow. I've never had something like this happen before and I've been riding bikes all my life.