Thanks for the response and clarification, HillsideVN!
Of course I exaggerated a bit when I wrote this.
It's still a shame that Suzi seems to attract all sorts of creeps, whether it's Johno the blackmailer or a drunk creep at the bar.
But If that creep was there to let Suzi show off how tough she is, then fine.
Honestly, I didn't realize that Hannah was in a pranking mood towards this creep until you commented on it. Look, first she convinces her friend to relax, have some fun and maybe find someone to make out for this evening. Suzi doesn't support her playful mood, but Hannah teases her and pushes more. Then she notices that the creep is approaching, and she seems inspired by the possible action, and even tries to restrain Suzi from getting angry. In the context of their previous conversation about having fun and finding someone to make out with, she acts like she doesn't mind this creep at all. She further encourages him when Suzi rejects his advances, telling him she's not interested, Hannah says, "I'm interested!"
Maybe I'm too bad at English and don’t feel some nuances, but her intentions seems ambiguous. If she had said to Suzi, “Looks like you've got an unwanted admirer, he's drooling over you last five minutes, let’s prank him” or something like that, then this scene wouldn’t feel so confusing to me.