[ Rachel doesn't often attend these parties, unless one of her friends really wants to go. They all decided to make an exception, since it's officially the last senior party they'll ever go to.
Seth and Noah are off ... doing boy things. They're her boys for sure, but sometimes she does not get the point of doing boy things. So she lets them have their bonding time and makes her way over to one of the big powder rooms for the girls to freshen up.
She's stepping in when a girl is drunkenly zigzagging her way out, nearly colliding with Rachel in the process.
She stops in her tracks when she sees who else is there. Breath literally getting stuck in her throat.