randy pierce was one of only 10 percent of competitors to successfully leap off a ledge , grab onto a rope and ring a bell while 25 feet in the air .
pierce lost his sight at 22 from a neurological disease .
he left his wheelchair for good in 2006 and has been running and climbing ever since .
hiked all 48 mountains in new hampshire with his guide dog quinn .
will run in memory of quinn , who passed away last year from cancer .