Your not supposed to get into the situation. Need to have your head out of the boat enough to see when someone is coming in on a wave and avoid that wave all together. If your going to pinch it close enough to get anywhere near him you gotta know you can get up and over it. If conditions are big and needing to chicken jibe is even likely, do it early on the wave before. Your right of way goes out the window when it poses risk to the rider whose focus is on riding the wave itself.
Agree with Starsky on this one.
You can see the other kitesurfer on the wave from far away (if not, you are not ready for this yet), so good "Wave etiquette" is that you bear away in huge distance from him - or even better - jibe or tack and ride away from him on one of the earlier waves so you dont ever get on the same wave
THIS is good wave etiquette - but of course takes some time to adapt to and learn.
If he did not yell, then you would not have written this post, and not "learned" anything, right ?
So eventhough I dont like that - it somehow makes good sense in this situation.