Yeah I have no idea. I haven't watched those movies for ages, and I don't have a working cd/dvd drive anymore and the movies are on dvd. Maybe the stick is connected to wugu magick? Kubus was a bit obsessed with that, and also transforming into a vampire. He was convinced that vampires were real. sticks are like stakes, stakes that can go through the heart, or instruments for casting magick.
i think kubus was just referencing the folk myth that you can find water with a pointy stick. i imagine he didn't even remember what he did it already when he was doing it a second time. shit like this is cool though. i wonder the kubus dimension is ever referenced in the films, i can't remember that ever happening.