A blind guy is going on about his favorite sport which is parachuting..

He said someone helps him do everything they lead him to the door and they put his hand on the ring to release the parachute. And someone asked, how do you know when to pull it. The guy said I can smell the trees and the ground from 300 feet. And the other guy says yeah but how do you know when to lift your feet to land? The blind guy says, of well the leash goes slack.