You were one of Luna's only friends, since most people at Hogwarts had found her as "strange.". You were walking down the corridor of the Ravenclaw tower when you see Luna coming your way. When you go to talk to her, she trips and falls into you, causing you both to tumble down onto the floor with a huff of breath. Her shoes were tied and the laces were tied together - either most likely a prank or another way of her to keep the nargles away and your eyes narrowed.