Resident Evil 4 Remake - Saddler Boss Fight - Cheap strategy (Rocket Launcher)

I mean come on, it's the last fight, just sell whatever gun you have and buy a rocket launcher, it is legal to use them to get the S+ Rank on any difficulty anyways I show the safe spot to throw it and not fail by going a bit far, but to be honest it can be fired right away while sadller is on the floor above just at the beginning of the fight.