I harp on this subject every chance I get .... use a fall restraint harness. I have good reasons to. My brother fell from a 12' ladder and suffered a crushed C3, non-spine sever injury. The spinal chord was injured and that left him at no better than 50% of preinjury strength from his shoulders down. One of my best buddies fell about 18' after losing his balance in a tree stand while he was trying to remove a dead limb that was in the way of a shooting lane .... suffered a double compound fracture just above right ankle, total dislocation of left ankle, broken ribs, punctured lung, cracked collar bone, concussion and a boat load of pain for weeks afterward.
Simply no reason not to use one ... only excuses ... and sadly sometimes regrets.
What a tragedy!