If you are looking forward to fishing that water yourself, and you know you are fishing iffy water, you should reel up and go down and fish the prime stuff yourself, but do not hoard the whole pool, simply because you happen to get there first. You just have the right to fish it first. If there is a question about what the fishing anglers intentions are, ASK, but permission is only necessary, if they are downstream of where you want to fish. You really see this get abused on the popular waters. The idea here is, If you are lucky enough to play a fish and you are in front of somebody fishing through, give him a chance at the next fish.
Different rules apply to different waters.
All these rules don't mean jack to a combat fishery like Hoodsport ,or around a bunch of gear guys, or even a crowded morning at Fortson Hole. You Are Out Of Line. Not only that, but you are probably going to get thumped. I was just pulling into the Ben Howard boat launch. It was the same two guys I had seen the day before, and the day before that.