That was a serious series serious punch against elder centipede, Saitama says it in the manga. Also before Garou gets picked up, he slams the ground then uses a tree and swings it so hard it generates tornado like winds. In the anime he slams the ground then screams.
The problem with the original production company is they are one of these really weird companies that hates to make a second seasons. Which is terrible thinking business wise. So you'll never see them make another.
manga is currently with the heroes inside the monsters headquarters in Z city.
Next season will be about that. (if it will be produced).
manga probably needs still 3-6 months until the end of the arc, each means next season, not before late 2020