I found it odd he told her I'll be gone 5-6 hours. Did he want her to get out? Did he want to get caught? Was he done with this? I wonder how long he was gone before she got out?
Possibly a test.
Also, about his restraint system. She's 13. It's a big, unknown space. He's violent.
He says he's leaving. It's quiet. Do you know for sure he's gone? Maybe he's already played that game already?
It's a twin bed? She's a small 13 year old. It could take a lot of effort to move heavy weights with limited mass, space, strength, etc.
Really, I can't express how much I admire Jayme for having the courage to escape from that ordeal. So brave.