Once Yun Jian said that, Uncle Zhang and her classmates who were behind her startled and swiftly looked for trashcans and all sorts of hiding places to shield themselves.
The guy who Yun Jian saved just now looked at her gratefully before going into hiding as soon as he could. He did not know that Yun Jian had not stepped out to save them because she was concerned about their safety.
When she said "You wish you could kill someone when I'm around. Dream on!" just now, everyone present, including Metal King Kong, thought that Yun Jian was protecting the innocent.
As a secret agent and assassin, she was no saint. It was not her duty to protect any one of them. Yun Jian would not bat an eye even if that guy died before her just now.
In spite of it, she did what she did. If one had to ask why, the reason was simple—she wanted to test Metal King Kong's capability.