In a split second, Katherine Stewart-Jones was flying over her handlebars and headed face-first for the road. She had been biking to her local gym in Thunder Bay, Ontario, on Sept. 19 when her bike’s front tire rammed into an irregular rise in the road and sent her off her bike seat and toward the unforgiving pavement below. A person driving by witnessed Stewart-Jones catapult off her bike and stopped immediately to check if she...