The bobber sits still, then dips. Tap right when it does. Tap too early or too late and the fish gets away β tap a stick or a clump of moss and, well, Trout Means Trout.
That's your three
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Fish Rule 2: a hooked trout that gets away before you land it is a Long-Distance Release. Fish Rule 7: Trout Means Trout β a convincing clump of moss doesn't count.