"Mr. Potter, I suggest you lower your voice." McGonagall said with a stern voice, her mouth twisted into a thin line. "You're in no position to yell at me, am I clear ?"With all due respect, Professor, my girlfriend is dying in that bed and no one seems to know how to stop it so yes, I will yell as much as I want because there's nothing left to do."That's Headmistress to you, Harry, and you will lower your voice right this moment or I will make sure you won't step a single foot in that room ever." That threat seemed to knock some respect into his head but he still growled in annoyance, his voice was now quieter.