An emergency crew rescued an injured hiker who fell 50 feet from the summit of a mountain in Washington state on Saturday, video shows.  The footage, released by local law enforcement, captured the challenging search and rescue operation as members of the King County Sheriff Air Support team scanned the vast wilderness surrounding Mount Si by helicopter. Located about 35 miles east of Seattle, the mountain's popular hiking trail ascends more than 3,000 feet over the course of just a handful of