page 39 of 960 of Sir Thomas Malory: Le Morte Darthur: The Definitive Original Text Edition

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Arthur makes Gryfflet promise to go joust with a knight at the fountain and then return back to him. Gryfflet does, he hits the shield (touching a knights shield left in the open invites a joust in this world) but he loses badly but the knight shows him mercy and Gryfflet lives. Mercy in action.