Well Stephen thinking he was responsible for the trap when it turned out to be new guy was sad but i have say his punishment was very surprising because you really didn't think she had in her to do what she did to him.
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Finally this episode actually made this series much better because we see them actually deal what happens when you betray the good guys the fact she did it was great. It was a harsh punishment but consider people die i felt it was justified.
I can't believe Stephen finally told his best friend about his ability you just know now she will be his weakness because she's human.