She glances back to see how he's doing and nearly tumps the damn bike over. She salvages it, though, shrieking with laughter as she goes.

Some part of her brain remembers that she should be more worried about his safety--no helmet and no real desire to patch up a staved-in skull--about his safety, but mostly she's focused on the fact that she's doing something stupid and fun with her friend. That's all that matters right now.