"As fast as Idaten" (韋駄天のように速い) is a living Japanese idiom, still used for a notably fast runner the way English might say "fleet-footed as Hermes" — except Idaten's fame comes specifically from a single legendary sprint, not general association with speed. Pairing that name with 台風 (a fully modern meteorological term, not an archaic or literary one) gives the final numbered form a deliberately mixed register: ancient guardian deity fused to present-day weather vocabulary, closing out Sanemi's naming set on its most mythologically explicit note.
That it's VIZ's only fully untranslated, name-preserved technique in this style is itself notable — every other Wind Breathing form gets rendered into English weather or folklore description, but "Idaten" survives as a proper noun, the same way VIZ generally keeps deity and yokai names (Zenitsu's thunder god Raijin references, or Tengu earlier in this same style) rather than translating them into descriptive English. As the ninth and highest-numbered form attested in the corpus, it also functions as a structural capstone: after eight forms spent cataloguing real Japanese wind phenomena, the sequence ends by finally naming the storm after a runner rather than the weather itself.