He turned back to Harry. "You'll soon find out some wizarding families are much better than others, Potter. You don't want to go making friends with the wrong sort. I can help you there."
He held out his hand to shake Harry's, but Harry didn't take it.
"I think I can tell who the wrong sort are for myself, thanks," he said coolly.
(Harry Potter and the Sorcerer's Stone)
Is ‘there’ a deictic indicating Hogwarts school where they’re going now, or does it have an adverbial meaning ‘at that point’?