An Alaska man has walked away with only minor injuries after being pinned down by a 700-pound boulder for three hours. Kell Morris, 61, was trapped by the boulder when he and wife Jo Roop were hiking near a glacier south of Anchorage, Alaska. Roop, a retired Alaska State Trooper, managed to hold her husband’s head above water as they waited for rescuers. A sled dog tourism company based on the remote glacier overheard the 911 dispatch call and made its helicopter available to rescuers, who would have struggled to reach the pair by road. Seven men used inflatable air bags to lift the boulder off Morris, who was hypothermic and drifting in and out of consciousness. “When it first happened, I was doubtful that there…..