Everyone knows Crusty Demons and everyone knows they’re complete lunatics. This video does not prove otherwise. Watch (then) amateur rider Seth Enslow attempt to jump from the same sand dune that Pro FMX rider Brian Manley had jumped a year prior. Dubbed the ‘double look back’ due to the jump being so big that Brian was able to take two long peeks over his shoulder at the take off position. Brian landed. Seth did not…