Barrier
They've just had another row.
Only this time, it's over for good.
He climbs the stairs to the boys' dorms and doesn't look back.
She feels horrible, it shouldn't be this way.
But if he'd just leave it alone for once and let her date someone else, she could make a better judgement.
The Common Room is deathly silent and when his door slams, the spell is broken and there has never been such a barrier between them.