The boy is pale, frightened-looking, and alone. "Can I sit here?" he asks, and Albus, who's all-too aware of how lost he'd be without his family gathered around him, cannot refuse.
He notices James look at him funnily, but puts it from his mind in favour of engaging in animated conversation with the boy whose name, he learns, is Scorpius.
It's not until James tells him later that night that the blonde's full name is Scorpius Malfoy, the son of a Death Eater, and Albus realises just who his new friend is.
And by that time it is too late.