The three stroke breathing means you can breath the otherside if you are passing someone. Since I could only breath left I could only pass on the left or if I was in someones wake I had to slow down and pass on the left. If I could choose which side I could just plough on instead of switching to breaststroke and raising my head tofu d a route. By the time I'd decided those ahead would have changed direction. It's a melée.