Re: Dry fly question
Trout have pea brains.
They respond to things that they are conditioned to recognize
Even though you didn't see it, your fly was dragging. ( micro-drag)
That's not natural and so the trout didn't recognize it as food.
When your fly tried to "escape" the water surface, that looked natural and the trout's reaction was to grab it before it got away.
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.” --- Horace Kephart