Relax, refusals are only one step down from a take.
Dennis had the only question this week and it comes in three parts. Part one - Do fish refuse a fly because of taste? It's possible, but extremely unlikely. Bonefish guides often squeeze a shrimp on their sports fly to increase chances of a take. Bonefishermen are careful to wash their hands after applying sun tan lotion. I've seen bonefish turn from over 100 yards away and swim up tide to a chum tube with live shrimp in it. So some fish use their nose to help in finding food. Technically this would be smell, not taste. I believe trout feed on floating flies primarily by sight. That said, I have seen trout come up to my fly and bump it with their nose (actually hooked one in the nose this year), so maybe. But actually by taste? No, if the fly was in their mouth you would have already hooked it. What causes a fish to reject a fly at the last second? Fishing as much as I do and for as long as I have I've probably had more flies rejected than most ...