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Saitama is surprised because he didn't knock out Boros or put him to sleep just like many that survived his punch.And about this, I can respect subjective opinions and all that but bro Saitama is literally surprised at seeing Boros survive his first punch. It's mild surprise, but he still didn't expect it. And analyzing visual and dialogue clues, it's clear that after Saitama met an opponent who can survive his punch's, Saitama starts to just test Boros, which is why Saitama allows the fight to drag on, outright asking Boros if he's used all his tricks yet mid-fight because he wants to know if he's wasting his time on another disappointment or not, meanwhile Boros, who himself had grown bored due to power, was having the fight of his life, hell Saitama might have been a little jealous of Boros, lol.