Such sneak attacks were very dangerous. Once they were discovered, they would be exposed. If the other party had guns, she would become a live target.
Ye Jian dared to attack like this because the two targets were walking separately and there were two trees between them. Moreover, the other target's vision was blocked, so he wouldn't discover her immediately.
As a special forces soldier, she had to learn how to win a chance of survival in the most dangerous environment, and professional skills were the guarantee of winning a chance of survival!
Ye Jian was a bold and meticulous special forces soldier. Coupled with the fact that she was hounded by Ye Ying in her previous life, she had an instinctive ability to avoid danger. She could quickly determine how to act in the most advantageous manner without arousing the other party's suspicion.