Who here has been able to hear a horn (besides yours) in a go-fast at 50 mph??? Most of my friends have assured me that they heard my engines well before I was near them.
Without being able to create some fancy animation, it's hard to explain how things transpired. The whole thing took about 3-4 minutes. Our closing speed was no more than 2 mph.
He had twice moved towards the left side of the river, then eased back towards the center where I was running. Each time, he had come back a bit further right and straightened back up as if he was headed further up the river. Each time, I had moved right a bit as well. I intentionally selected the right side to pass, as he seemed more interested in the left shoreline.
If I had decided to pass to his left, and he had turned left (again), I would still have been in the wrong place. At any rate, I was already easing further away from him when he turned. If I had turned left without slowing, I would have t-boned him. Remember as well, he took no evasive action once he saw that he was turning into me; he just continued his turn...
The formal Rules of the Road (ColRegs) are not absolute, but they are pretty much arranged in order of priority, and Rule #1 is Maintain a proper lookout. That means: know who is around you.
The point here is not so much to assign blame, but to get us all to think. I for one, will remain vigilant.