The foiler's error was not alerting the longboarder he was there. So fast and silent, coming from an unexpected angle, looks like he didn't see or expect the foiler, otherwise he wouldnt have faded into him. Foiler should have given a hoot then did a cut back, give some space to see if the surfer makes it, or once things stabilize could maybe pass him and carry on. The foiler did the equivalent of racing up to a truck on a motorcycle then tail gating in the blind spot and have the truck change lanes into him -- whose fault?Easily avoidable. I don’t blame the foiler though. Long boarder just doesn’t know what foils are capable of. Never knew what hit em. Board might’ve been damaged but no personal injury is guess.
Raises a good point about foiler etiquette though. In most situations, we can get so many and so much better waves...so try to leave some for the kooks. I will sometimes hang back and encourage them to drop in on me. Then when they fall off or bog down, I can jump back into the pocket and take over. Enough waves for everyone eh ;-)