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In that contest, Moore captured a bronze in freestyle and finished sixth in best trick. Two years later, his biography on ESPN said, “Caleb Moore has gone from ‘beginner’s luck’ to ‘serious threat.’”

That was hardly a surprise to Vaught, who said, “Whatever he wanted to do, he did it.”

Vaught said Moore didn’t believe his sport was too extreme, but rather “it was a lifestyle.” He was good at it — along with ATV racing — as he accumulated a garage full of trophies.

Fellow snowmobile rider Levi LaVallee recently described Moore as a “fierce competitor.”

“A very creative mind,” LaVallee said. “I’ve watched him try some crazy, crazy tricks and some of them were successful, some of them not so much. But he was first guy to get back on a sled and go try it again. It shows a lot of heart.”

X Games officials said in a statement that they would conduct a thorough review of freestyle snowmobiling events and adopt any appropriate changes.

“For 18 years, we have worked closely on safety issues with athletes, course designers and other experts. Still, when the world’s best compete at the highest level in any sport, risks remain,” they said, noting that Moore was hurt performing a move he had done several times before.