I'm with JF on this, if that was me, I woulda been upset, now the fact they were elders I probably wouldn't have thrown something at them because that's just lack of respect, but I would be pretty furious talking to them. How can you not see a kayaker with a BIG ass ORANGE flag at the stern of the kayak. The whole point of the flag is to avoid that situation, boaters that are not responsible should not be allowed to launch.