A few days ago, Teddy had tried to approach him, but Ron dragged Harry away from him and told him stories about Sirius Black that gave Harry nightmares. He also told Harry that students between Houses should only occasionally socialize because of the inter-house rivalries. Harry was a little skeptical of this, but it was also confirmed by Hermione Granger, the girl they met on the train searching for Neville’s toad, who seemed to know everything about everything and everyone.