I was climbing the underside of a large almost dead oak. My lanyard snagged, I thought I could just release the lanyard for one "quick" second and flip over the snag. I had my saftey crouched in above. When I released, I was as I said on the underside of a large lean, I swung around like a pengulin into a branch 6". A direct hit on the ribs. I finished that job not problem. The next day............ouch...