In terms of character development, this paragraph is really solid in its establishing how the man feels about the rain - not just that he loves rain, but that he loves it because it washes away filth - a great way to provide a measure of depth for your character in a short space.
One thing I wondered though: how could he watch the rain beat against the drywall if he was inside? Also, drywall can’t get wet. If it does, it swells and needs to be replaced. So if rain is beating against the drywall and he is watching this but the drywall is also keeping him dry, there seems to be a bit of logical paradox in that. Maybe I am missing something, but it is the only thing that jarred me in an otherwise excellent prologue that has compelled me to read on, which I will do now! - Jeremy
