it's literally just that
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And when Luffy’s arms retracted back to himself and started shrinking, air hissing every which way, Ace assumed it was because Luffy was going to try another method and thus took the opportunity to dive straight into his little brother’s space in this moment of vulnerability to knock him out with one clean punch—only to skid straight to a stop as the steam cleared and Ace came face to face with a small Luffy staring belligerently right up at him with his little head only barely reaching past Ace’s knees.