who overheard most of what her brother said to Sarah

A minute after Jon walked off, Zoe poked her head out the door, and saw Sarah there. *Jon said she couldn't move, and she isn't moving now. What did he do?* She walked to Sarah, and picked her up. "If you can't move, then you probably can't do anything to hurt me, either. How did he do this, though?" Still wondering, she carried Sarah back to her room, and cuffed Sarah's arms to her bed. "Be glad. If you weren't in such a weird position, I'd cuff your feet, too. But what do I want to do with you?"