Watching the video, I see that on the left side there is a sidewalk, the woman can get off on this side, and the man could turn around to approach her, well, what is meant to be shown here is what you say in the post.
¿What would I do? First I would tell the driver to get closer to the dry side, this reminds me of the movie Titanic, the man fits perfectly on the rock she is on, and lets himself die, it's silly.
Now, if there is no way to get closer to the dry side, simply, I take off my shoes, lift up my pants a bit and go for the one who will be my wife, I carry her in my arms and then I dry myself and get organized again.