The Weasley's, the youngest son in particular that Hermione had stabbed once upon a time, glared vehemently at Potter and she recalled that he had left the Order in seemingly rushed, bad terms. He had mentioned that he knew something about them, discovered something that he felt worth leaving, and she presumed that from the violent stares between Potter and Weasley that the latter of the two had not been equally informed in whatever it was that the former found out.