Jack was down at the other end of the bar, he hadn't made a move to say 'hi' to Megan or Susan just yet. Instead, he was on his second beer and was chatting away with a brunette who apparently remember him from Hogwarts. She was three years younger than him though, and apparently she used to sit by him during dinner and instead of talking to her, Jack always spoke with her blonde friend. He couldn't tell if she was offended by his lack of attention, but by the looks of her, he couldn't understand why he'd chosen to overlook her. She was cute, little, and had this funny laugh, but he didn't mind it.
When Meg and Susan walked in, he eyed them as they made their way to the bar. He didn't approach them, he just continued to be interested in the girl in front of him (though now his mind was wandering and he couldn't pay attention to her; Hogwarts all over again for the poor girl). He'd wait for the girls to head to the dance floor before he started dancing with Susan, preferring the element of surprise over anything else.