It's always a hard call whether to stop or not at an accident, especially when there are other people assisting, and you don't have any special medical training. I think you did the right thing on the day.
With all due respect sunburyprince, it appears Patesler assessed the situation and others were stopping to assist the injured rider so he rode on, he could offer no medical assistance.
It is better he went on instead of rubber necking or creating a bottleneck which could quite possibly cause more injuries and accidents.
However it is good to see cyclists stopping to offer assistance. SOMETIMES other cyclists can be used as make-shift Marshals, to warn oncoming cyclists and vehicles of a hazard ahead. Otherwise keep moving!