Asterion always stops before entering running water
He does that because of what he is. So it's funny Larian hard coded that behavior in his character but didn't code in perceived hazards on the ground for the other companions. And in my IMHO it's actually irritating with astarion trying to take a different path when near water as it has several time led him to aggro mobs that I tried to apprehend from another direction. i.e. the owlbear cave
