Under Wendy's direction, Peter and the Lost Boys are pretending to be King Arthur and the Knights of Camelot. Wendy (as Guinevere) gives Peter her handkerchief to wear and informs him that it is his duty to defend her honor. Peter becomes so wrapped up in the game that he refuses to step out of character when the pirates get involved. That means that he refuses to take off his heavy armor or fly away from danger even when he needs to most... (thetvdb.com)