If I were to guess what happened at Dixon I'd say they happened upon her and her nest and tried like hell to catch her. They probably tried everything in their box, she's big (still alive) for a reason right? After a few hours or so they were probably dying to see just how much that fat girl weighed so he rigged his smallest heavest bait, a jig, with an oversized treble with the intention of snagging her. After finding out she was a WR he realized he couldn't do anything but put her back and try to catch her legally. I'm just guessign here but I can see why he did what he did. He probably thought it wouldn't get around until he pulled her out of the water and realized she was huge. Having witnesses doesn't help, especially when intentionally snagging a fish. Curiosity got the best of him in a moment of weakness.