"I thought the chains at the secret underground house were still strong enough to hold you down till morning when you shift. Why buy new ones? Aren't they going to hurt you? They look too strong, You are not an animal, Sydney" Ellie complained, showing real concern for Sydney when she saw her stuffing new chains inside the backpack, which she must have bought recently.
It looks new, she must be planning to take the chains with her to the woods. They look stronger and huger than the normal type of chains she usually used to chain herself up.
This wasn't necessary, it's only going to leave several types of marks on her body when it's morning since it'll be really hard for her to stay in control. She would keep trying to break out of the chains holding her down, which was the only thing capable of stopping her from breaking loose, and hurting anyone until the full moon was gone and she would turn back into a human.