"You heard Trevor, he said his grandfather often asked him about Scorpius. Don't you think this is proof that, all this time, he has been nurturing vengeance? It corresponds with what Nott told you at the Manor. Maybe he wasn't lying, he really wanted to hit Scorpius to hit your family! I think we should consider that, if we want to find the Sparrowhawk. It could be anyone, even another Death Eater locked up in Azkaban with whom Nott had allied himself."