Seriously though, who hasn't been to the beach, in the water, and caught by a wave that surprised the heck out of you with it's weight and strength. I've had my feet knocked out from under me by 2 foot waves. Throw in the receding/opposing water coming back from the shore, and sand washing out from under your feet...you've got some power there. I'd just as soon not be on the beach when a tsunami comes rolling in.
The wave I got caught in was something.
I saw it 400 feet away, I ran a good 500 feet, jumped onto a 3’ to 6’ diameter drift log then waited as the water went up the beach another 200’ to 300’.
It was at low tide on a very shallow beach. The one wave travelled more than 1,000’ up the beach than all of the other waves.
As I stated prior, the two ladies to the south were scooped up and drowned.