Actually, Lana isn’t a murderer. In ‘Kara’, Lana Lang was officially dead, so he easily could get away with anything. She pointed gun on Lex. He came closer and asked her to shoot. That time Lana’s face was screaming _’I’m not a murderer! I can’t kill even such a scoundrel like you!’_ Even Lex knew it, that’s why he wasn’t afraid at all. However he got scared in ‘Wrath’ because she had powers. Of course, Lex thought something happened with her mind too. Lana couldn’t get away again with super abilities. And what did she do? Instead of electrocuting the villain when he got distracted (kissed her), she just pushed him away! These two scenes PROVE that Lana just wanted to _scare_ Lex. Then when Clark came, she provoked him to kill the villain because actually she wanted the future superhero to prove for HIMSELF he would never kill anyone. That’s why later Lana didn’t tell Clark her real intentions, excusing herself by powers. Also these two scenes prove that in ‘Nemesis’ Lana also wanted to scare Lex, not kill (she knew all exits in the underground maze). Don’t forget she had been taking hormones affecting her.
