Harry wanted to walk from Haven's Loft to Hogwarts, but the draining of his magic had been sapping his physical energy as well. It frightened him somewhat, to know how closely his health was tied into his magic, but there was nothing to be done about it now. Instead, he hoped the Order might have some answers, and used the dreaded Floo to reach Hogwarts. The ride was bumpy, and he could tell the network tried to drop him off at blocked gates. By the time he arrived in the right fireplace, Harry felt as exhausted as if he had walked.
"All right, let's get started right away," he said as he walked to the front of the room. "We were with Regulus when the Dark Mark flared. Do you have anything to add S-" Harry looked at Snape for the first time and couldn't miss the decidedly feminine look of him - more feminine than his usual drag routine.
Sodding magic! I get weaker, Faelan gets stuck as a wolf and Snape turns into a woman!
Harry cleared his throat and began again. "Snape, do you have anything to add?" It was rude to address him as just 'Snape', but he was always the first one to remind someone that he wasn't a professor anymore, and at least he'd avoided pinning down his gender. Besides, everyone expected Harry to be rude to Snape; he wasn't fussed over it.