That video is amazing. The water is rushing across fields, and eventually you can see a road ahead with cars driving across it. The water was headed right for the road as people kept driving by.
The thing about tsunamis is that they aren't just tidal waves. They're surges that raise the sea level. So as the water starts flooding the beach, it keeps coming. It's not one wave event - it basically raises the sea level at the shore, and it stays high for a while. That's why the flood can go so far inshore. One big wave would die - the surge lasts and keeps doing damage.
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