Manmademan
Member
As for Lois, she had a Kryptonian weapon, these actually hurt them regardless of atmosphere and can knock them down. At the beginning of the film the ships defences that Clark investigates managed to cut Clark despite his strength, and they shoot him at one point which severely knocks him down too. I wouldn't be surprised if this ends up becoming the universes Kryptonite to hurt Superman.
Wherever would the avengers find something like that?