When I was looking at the video, to be honest, before the waves hit the land they didn't look that big to me. Bigger than normal, but if I had actually been there I don't know if I would have run either. Looking at the video I was kind of expecting the wave to crash down and then pull back, perhaps coming a little further in than normal, but not at all in the way that it turned out. I think most people expected the same i.e. their visual perception of the waves before they hit land vastly underestimated them. I think it's probably hard to guage the size of waves when they're out at see, not to mention the power actually pushing them in. In so many of the vids you see the wave coming and coming, and then the people with the camera only start moving when the wave is right in front of them.