Its called flossing. The funny thing is I fish that way at blue creek/the point too. It seems about 50/50 hooked from the inside out. Most flossed fish will be hooked from the outside of the gillplate in. The theory is the 6-10ft leader is srung out and the line gets caught in the fishes mouth you feel em' when the line gets tight and the hook gets em' in the gillplate or near there. Many think its not good sport, but many people haven't fished sockeye in alaska either.