The case in the entrance (from a newspaper article)

25 июля 2011 (01:06:42)

Knock at the door. A loud agitated voice begged for help: "He is bleeding! Urgent Help!" Ludmila rushed into the hall, put on the shoulders of his jacket and ran out onto the landing. There was no time to think. After all, people are in trouble! He was bad! Faster on the eighth floor, there lived a doctor. But what is it? Those who wanted to help Ludmila suddenly grabbed her arm, pulled over. The other guy pulled out a knife, exhaled sharply, plunging the metal into a woman's body supple...

What is forgotten Lyudmila, leaving the apartment? What are its qualities benefited criminals?