Before filming could be completed , however , Ashton was left paralysed following an accident during a trials demo .
Before filming could be completed , however , Ashton was had to call on friends , Danny MacAskill and Chris Akrigg , to help finish the film .
Before filming could be completed , however , Ashton was left paralysed following an accident during a trials demo and had to call on friends , Danny MacAskill and Chris Akrigg , to help finish the film .