Enel’s “lightning produces thunder”, Nami’s statement [Nami is a very knowledgeable navigator so she should know key information about Lightning and Thunder.] implies that in One Piece - hearing thunder means the air expanded at light speed. [Note: Thunder is air rapidly expanding around a
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One Piece Chapter 1092: The Tyrant Kuma's Rampage Through The
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User blog:USklaverei/One Piece - Speed Feats (Skypiea Saga)