That fish was already near death when he "caught" it. If he actually hooked it, it was a snag. The Chinook salmon stops feeding when it leaves the ocean to spawn up in FW rivers/streams. Males develop the kype jaw deformation to spar with other males. They can't feed with or even close the deformed jaws. And, after spawning the breeding pair dies within 2 days to 2 weeks of spawning (from starvation and exhaustion).