I didnt. I asked what they were doing and they replied with "we're part of the local band". I was still unsure so I asked a couple of the more seasoned fly fishermen at the same pool, and they told me that they were told the same thing. They didnt stay long after I arrived; if they had I probably wouldnt have stayed. Ive only been flyfishing a few times, and the old boys fishing next to me didnt seem to take issue with it (at least the food fishery part), so I just let it be. I suppose they could have just lied to us all about belonging to a local band, but that would be a pretty bold(stupid) thing to do in front of so many witnesses.