Which is not, incidentally, where he seems to be anymore. It takes him a moment to realize this, as he is busy kneeling on the ground, recovering the books which spilled when his bag broke. But when he does look up at last, when he does notice that the sidewalk seems to have disappeared, he freezes. He is-- his mind scrambles frantically for an answer, but the only one it can come up with is-- elsewhere. Somewhere he's never been or seen before.
He's a ridiculous sight, really-- a small, skinny teenager, looking much younger than his nearly eighteen years, as still as if he'd been frozen by Medusa into a statue of crouching, bewildered boy reaching for his torn book bag, an armful of music books spilling back onto the floor.
Posner is from The History Boys by Alan Bennett.