User blog comment:Bendyfanman/1,000,000% smash, isnt really 1,000,000%!/@comment-28362353-20180409142927

Of course it’s not 1,000,000%. It was just an adrenaline rush that pushed him to use over 100% of One for All, similar to when All Might fought Nomu, he was using over 100% the whole time, or when he used United States of Smash against All for One.

Long story short, it’s not 1,000,000%, rather an adrenaline powered 100% smash. If it really was 1,000,000%, then Deku would have exploded and Muscular would have basically been erased from existence.