Colby Stevenson came up big last night as he took home a silver medal in the big air men’s freeskiing final. He crashed on his first attempt, but two monster runs propelled him to the podium. Stevenson’s comeback may have been a surprise to some, but people who know his story may call it more of a habit. In May 2016, Stevenson was driving home from a ski competition when he fell asleep at the wheel. “Shattered my skull,” he said. To be precise, his skull was shattered into 48 pieces. There was a time Stevenson didn’t think he would be able to go about life in the same way again, much less ski,…