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At that time, Xiao Tingyun did two things: she quickly grabbed her phone and took a photo of the person's back as he slipped out the back door, then went back to the girl and performed emergency treatment on her. Of course, she also untied the ropes binding her and covered her with some clothes. This might affect the police's ability to collect clues, but she thought the girl's dignity was more important, and the fewer people who saw her in that state, the better.
As for capturing the murderer, they already had enough clues and evidence.
Then, following Qin Yu's guidance, Xiao Tingyun contacted the police and the hospital using a new, unregistered card.
Once that was done, all she could do was wait for the hospital and the police to arrive. Xiao Tingyun knew it would be difficult to catch up with the person now, so she used the waiting time to observe the basement—specifically, the room in the back.
