What happened to the iron spine shine water?

Iron fell off the cliff, and Shui Lingguang returned to the place where she and her mother once lived.

Later, Tie Tang Zhong finally came back, but he was badly injured, and his leg seemed to be lame. He went to Shui Lingguang and was very happy. He also picked flowers for her.

Maybe Shui Lingguang was desperate, thinking that Tie Tang Zhong would never come back, so she dived herself.

Tie Tang Zhong jumped into the water to save her. When she was rescued, Shui Lingguang was already dead.