Why was Bryson DeChambeau given two-shot penalty at The Open? American ‘fired up’ after controversial ruling

Bryson DeChambeau received a two-shot penalty during The Open Championship at Royal Birkdale after being found to have improved the area for his backswing on the fifth hole. The ruling left the American golfer visibly frustrated and 'fired up' according to reports. The penalty was applied under golf's rules prohibiting players from altering conditions that could affect their stroke.