When two characters in DBZ collide there is a huge ball that forms from all the power created. The rain did the same thing. I don't really think the rain is there to copy a DBZ fight I was just saying there are a lot of similarities between the Burly Brawl and a DBZ fight: mid-air fighting, charging at each other and hitting with a great force, throw each other down creating a huge crater, and when Neo and Smith punch each other just like Goku and Majin Vegeta did in there epic battle of the titans. I'm saying there are a lot of similarities, I still think the fight was awsome and it has never been done before (in a movie)