"Then take off your Invisibility Cloak — there is no need for it now — and let us take the plunge," And with the sudden agility of a much younger man, Dumble-dore slid from the boulder, landed in the sea, and began to swim, with a perfect breaststroke, toward the dark slit in the rock face, his lit wand held in his teeth.
There are no more uses of "agile" in the book.
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She is amazingly agile for someone so tall.
Her agility allows her to guard even the quickest ball handlers.