Leila was fascinated with the tissue paper, seeing it the way only children can, as a toy. She was throwing the tissue in the air and chasing it as it floated slowly to the ground.
Harry felt the tug of the Tether spell Hermione had cast on them so that the little girl couldn't get more than 20 feet from him - she was nearly out of the box, but stopped and looking confused. "Not too far, baby," he called, which seemed to snap her out of it because she laughed and began chasing the tissue back toward them.
"You are going to teach me this spell tomorrow, right? Because it's going to come in handy when Serenus' twins get older," he said, slinging an arm around Hermione's middle and hugging her close. Faelan hadn't made a break for it yet, which he thought was a good sign.