The ball resets if it touches water. If you want to make the stands reset the ball, a lazy fix would be to cover them in a 5 unit wide layer of water with a nodraw texture on it.
That’s actually what I’m trying to avoid. People throwing the ball into the stands as a cheap way of defending their own goal. I was hoping there was a way to do it like in the video I posted up above. I guess the best course right now is just to use a regular world brush with nodraw around the stands.