Faustus shrugged; he guessed that Harry had put up with that from what little his mother had told him. But it seemed almost natural to be wary of people, to wait and try and judge what they wanted. He wasn't sure he'd got all of his judgements right but he hoped he had.
His eyes widened at Harry's litany of things he'd done. "You did all of that?" He then frowned. "Why were you exploding cauldrons? Making potions isn't that difficult."
His mother had taught him a bit and Dad had allowed him to come into his workroom on a few occasions after he'd shown that he knew what he was doing... at least at the basic level.