There are some new people, I will give it again. Donkeys have instincts about water. Can be worth your life to step in water or mud, if you are a donkey in your natural environment. They are desert evolved, predators hang around water holes in the desert, to slip or be slowed by uncertain footing can mean death. And being instinct, it works regardless of where you take the donkey.
Logic means nothing.
You lead the donkey up to the stream, and it balks. It's eyes go wide. You are mad. Mad, mad, mad. Plenty to eat on this side of the stream.