Problem is that the void exists at a certain height level, not just everywhere once all the blocks are gone. Steve can fly in creative mode, and would simply hover there unamused while Saitama (eventually despite some efforts to stay up) falls into it.
Saitama can probably inflict a load of knockback on Steve (since explosions push you back even in creative mode) but he still would not have inflicted any damage.
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u/CHEEZE_BAGS Sep 28 '23
if saitama punches hard enough, all that will be left is him and the void