From the looks of things, only a small three inches chunk held the chain together. If Rin could cut through this chunk, she would be able to free the creature.
She had been on this for more than twenty four hours and had nearly depleted all her energy but as she was doing this she could feel a breakthrough coming.
She took this as training and didn't relent even though that small chunk which was the only piece, holding the chain together was being a huge problem for her.
She had been striking it for more than six hours but it refused to budge, even when she multiplied the attacks by a thousand times, it was still the same.
"Ahhh!" Rin screamed as she gathered energy into her right hand as well as the dagger and struck out again.
Blang! Krryykkk!
On making contact this time, there was finally a small crack which put a smile on Rin's face.