A routine trail ride in the dense forest of British Columbia took a terrifying turn when a massive grizzly bear launched an unprovoked attack on an unsuspecting mountain biker. Security footage from a nearby environmental research station and the biker’s helmet-mounted camera captured the raw intensity of the encounter. As the bear charged out of the thick brush with a thunderous roar, it seemed the cyclist would be overwhelmed in seconds. However, a local guide’s rescue dog, a 120-pound Malamut