My addition to this - I was riding a few years back with a buddy of mine and he ditched really bad, banged his knee into a rock, was practically in tears (and this guy doesn't cry). We were about 3-miles +/- into the ride. Anyways, at least two guys wen tbuy and didn't even stop - we even asked as he was going by if he had antispecti / bandaids / etc. and the guy kept going ! I remember thinking to myself; what a prick! Oh well. i woudl've stopped. But I also call 911 when I see a car accident, even if I think someone else already called. Everyone thinks someone else will take care of it.