If you are only referring to jumping in the water, I sort of disagree. I pray for fish exciting enough to get me to jump in the water after them. I couldn't completely rule out myself jumping into the water after a special enough fish. It's entirely possible I am a tool too though.
And before we go too far down the "it was on a spawning bed" path, I put that down as a maybe. It's a reasonable assumption, possible for sure, maybe even likely, but also not completely certain without first hand knowledge that it's bed was there. That fish definitely ran into the river to spawn, it was definitely caught sight nymphing in an area it was interested in spawning near. I have walked that creek many times in that season, and some are digging and on beds for sure, others are hanging and waiting for the right fish, or waiting to fully ripen and not yet spawning, not yet ready to go. Small kokanee are in there spawning first, some of those browns come in early to eat kokanee. Many others just aren't spawning at all, beds show up in that river at all sorts of odd timings. Can you fish at all in the fall for browns at all? Hard question without the obvious sighted bed to keep you walking.