We were discussing being an electron that traveled through the booster, and I asked you how it would get to N. We know that electrons will always take a path with no resistance if one is available to them. Wires that are shown with bends or connections do not affect an electron. They only sense whether or not there is a resistance in the path.
Let’s forget for a moment that in an AC circuit the electrons will be moving back and forth. Just imagine a very slowed down bit of time when the electrons are moving from L1, through the booster, towards N. If you were an electron, coming from L1, going through the booster, how would you then get to N?