You did the right thing, people don't hear you over the noise of the surf and half the time they're wearing a hood. I have no qualms about yelling or raising my voice if someone looks like they're gonna drop in, or hit me, you got to look out for yourself. In a couple years the guy who yelled at you will figure it out and then he'll be yelling at kooks to watch out for him. Its' the circle of life in the surfing world...
You gotta put your personal safety first because if that guys bic k.o.,'s you you're dead. As in deceased. You really think a guy who isn't attentive enough to see you in his way nor hear you warn him, would notice you floating face down on the inside with the bic emblem indented in your forehead? I don't think so.... Face it when you're in the water, you can't count on anyone to take care of you so you have to look out for yourself sometimes that means yelling or raising your voice to get someones attention.
It may have been a good idea to tell him, you were just yelling so he'd hear you and not hit you... People can be pretty sensitive in the water and take a well meaning comment, like watch out, when they're trying to drop in and make it like your'e the a-hole.

So, is there any tread left on the tires? Or at this point would it be like throwing a hot dog down a hallway?
Stewie Griffin