Hi. I understand a lightning rod reroutes the current of a lightning around an object, e.g. building. The lightning will preferably strike the rod because the electric field is strong at sharp points and the air is more likely to be ionized there. But does it also avoid lightning by giving off charge to air before ionization occurs and thereby reducing the charge difference between building and cloud? I know that e.g. placing a needle on a Van-de-Graaff generator makes it lose its charge very quickly (without sparks), so why wouldn't this also happen with lightning rods?