Don't have a clue. The guy behind me had said it looked like my rear tire locked up. I wasn't in a curve. When I went back to look at it there was some pea gravel about a foot onto the road so just guessing I probably tapped the rear brake close to the edge of the road I started to slide and with the shoulder only about a foot wide before starting down the embankment off I went.
You really scared us with that one. Glad you made it through so well, more glad got to ride with you since. Have to do another soon.
We will, You were with us that day I went back to look at the site.