The Black brothers blinked at her.  Reggie because he didn’t know that Siri had told her their nickname for the Headmaster and Siri because... "I did," he said.  "AiDee told me that I was seeing things and that the assailant was probably some seventh year that left in May and that I didn’t have any proof that it was Snape.  There were more than just redheaded girls hurt last year and the fact that the redheads couldn’t remember didn’t mean anything because a couple of the brunettes were obviously Obliviated too."