Confront her.

"Hey!" you say. "Nobody pushes Belinda around without going through me."

Belinda looks worried. "It's all right, Parker," she says. "We were just talking. Really." You shush her, still staring at the girl and she subsides.

The girl seems to be sizing you up and you suddenly realize she's quite a bit bigger than you are. She stares right back at you and you flinch a bit under her gaze.

"Look, slut," she spits at you. "You're new here so I'm going to let this pass this time, but I'll do whatever I want with this piece of tail here." She grabs Belinda by the hair again and yanks her away from you. Still facing you down, she says, "Or do you want to take this somewhere private?"

Belinda looks at you pleadingly. You size up Roxanne yourself and you know you have no real hope of beating her. Maybe when you were a boy, but not now. "There's no need for that," you say, trying to remain calm, but your adrenaline is working overtime. "We can just talk about this. Just let her go please."

She pushes Belinda back over to you. "Yeah, that's what I thought," she says and turns and walks out of the restroom. Belinda doesn't say anything, but she looks a little embarrassed on your behalf. "Shall we go now?" she asks.