New Olympic snowboard halfpipe champion Ayumu Hirano says that riders are “putting their lives on the line” but not being scored “accurately”, calling for better judging. The dreadlocked Japanese beat retiring legend Shaun White and a host of others to win gold in the men’s halfpipe on Friday, but he had to come from behind on his final run to do it. Hirano said he was “angry” and “didn’t understand” why his jaw-dropping second run did not put him into first place, and on Saturday he called for wholesale changes to the judging system. “We want to have sound standards and I think we should look…