In March of 2018 when the ground around Ontario was frozen solid as a rock, Warren Byrne took a nasty spill. He had just hopped on a hot-headed unraced 3-year-old gelding when it took off blindly. Byrne was pitched onto the hard ground, breaking his upper arm--an extensive fracture that required a plate and seven screws. After the surgery, doctors warned Byrne that he was suffering bone-density issues from a medication he had long taken, describing the problem as being akin to early osteoporosis. He also reacted badly to the...