Well Sh!t Todd, Didn't anyone ask him what he would do? Changing flies at some point has to be part of the routine unless you're an elitist or stubborn. I have personally seen that work for myself and others multiple times. My daughter caught a fish on the Ronde a few years ago that hit after the third fly change and struck at all 4 flies it saw. It happened to be the original pattern in a smaller size that it actually took. I think Salmo's theory makes sense, they may be hitting the fly to drown it but not actually taking it. Challenge is to figure out how to stimulate the take.