Let me take what I wrote in post #60 and expand a tad more.
After getting spooled and having the long drive home to process what happened, you decide to burn a vacation day the following week and head back up to even the score with the fish in that pool.
Knowing that the action didn't happen until later in the day you run errands and get to the river around 3pm. The flow looks identical, the temperature and clarity are perfect. You suit up and get to your spot. The next 4 hours are spent watching the river for bugs and risers. You double check the leader, your knots and drag setting. The sun starts to fall and you think you know what is about to happen. Blanket hatch of ISO and not a single rise. As you stumble back to the vehicle an hour after dark, you blurt out "What the XXXX was that?". Voice out of nowhere, "You had a good night too, eh? That was as something else tonight. Lots of good fish ". It's a car parked on the shoulder with an angler changing out of his waders. You just wave, load up and head back to the room.
Was that guy full of it or did you completely miss what was going on? You grab a quick breakfast and listen to the fly fishermen in the next booth discuss the killer morning they just had over by where you were last evening. You hear them saying that they were on the water 30 minutes before sunrise and had trash feeders for the first 3 hours of light.
Same river, 2 conflicting stories. You ignore it and set out to try a different section during the day and then to the top of 'the pool' for an evening rise. You spot several fish but they refuse your terrestrial and caddis patterns. You trudge on to find the big fish of the day. You spend 45 minutes creeping up to a casting position. You observe him eating every single daytime sulphur going anywhere near his feeding lane and tie on the perfect match. As you dress the fly, an eagle passes overhead. The shadow goes over the fish sending him bolting for deep water. You sit for 90 minutes but the fish never returns. Oh well, heading going back to "the spot" and evening the score with the one that spooled you the prior week. 3 hours spent watching the pool without a bug or rise. Driving back to the room, you begin to wonder what you are doing wrong or if first light is better.
Sunday, day three, last chance for glory. You decide to get up at 4:30, grab a gas station coffee and get some of those trash feeders at first light. At 11:30, you are fishless, hungry and a little pissed. Back to the gas station for a questionable tuna salad sandwich and more coffee. Hustle back to the good spot by 1 and see what happens. Micro caddis and midges. No risers but you know ISO hatch should pop by 6pm. In the last 30 minutes of daylight, hatch starts and you finally see a few fish feeding. You land a beautiful 7" wild brown on the first cast. Refusal after refusal as night approaches. You lay out the perfect cast, it drifts a foot and disappears. You go tight only to see an 8" chub roll on the surface with your fly in it's lip. As you water-ski the chub toward your hand in hopes of getting a few more casts before it's too dark to see, boom! Just before the chub is to hand, 24" brown smashes the skimming chub with enough force to take your fish, fly, tippet and the two sections of line above it. Too late and dark to re-tie so you stumble back to the vehicle. Sickened, you start the vehicle and head for home. "F this place, I'm never coming back here" you yell as you merge onto the highway.
Most don't come back. Those that do, have paid their dues and they continue to come back for 35+ years.... like me. The river rewards persistence and you look for "that epic day" which comes every 7-15 years 😁