When Headmistress McGonagall arrived in the potions lab, she had no idea what she was getting into. Snape was having fits trying to erase the black board and screaming at Harry, who just sat there waiting.
"What pray tell is going on here?" The headmistress said with an extremely angry tone.
Snape turned his voice was wavering with anger, as he pointed at Harry. "This boy has the audacity to tell me how to teach my class."
McGonagall looked to Harry. "Mr. Potter, tell me about this."
Harry spoke with complete respect in his voice. "I just pointed out" pointing at the black board "that if we made the potion as instructed on the board it would cause an explosion. Then I noticed he gave all his Slytherin's notes to do it correctly. Is this a normal way to teach a class where you attempt to hurt students possibly kill them?"
Minerva Checked what Harry was saying and found it true. She turned on Severus.
"Class dismissed, Severus My office NOW!"
Severus Snape followed the Headmistress like a wounded puppy. Albus had never said a word about his methods it looked very much as if he had a lot of explaining to do.
When she went into the transfiguration office she motioned for Snape to sit.
"Now, Explain yourself!"
Snape hemmed and Hawed for a few moments. "I have always taught this way, Professor Dumbledore had no problem with it."
Professor McGonagall called her house elf and whispered to her. The elf popped out and Snape began to rise.
The anger in Minerva's voice was extreme. "Sit down; I'm not finished with you yet!"
Snape looked like a deer in the headlights.
"Now Severus, we will discuss your performance as a teacher."
The elf popped in with a large stack of documents.
Minerva pulled out the summery sheet for his tenure at the school.
"Last year we had the lowest recorded number of NEWT level potion graduates in the history of Hogwarts. It has declined every year since you began teaching. Can you explain this?"
Snape had no idea he was getting a complete performance review out of this. His answer was not to Minerva's liking.
"When you give me a group of dunderheads to teach you can not expect much."
Minerva looked over her glasses. "I have complaints about your so called methods from every year since you have been here. Not one has ever been addressed. I am addressing them now. You are on probation as of this moment. I will have all your classes monitored. If I hear of so much as one dunderhead leave your mouth, or you do anything that threatens a student like the one I saw today. You will find yourself outside looking in. DO I MAKE MYSELF CLEAR?"
Severus sunk into his chair. "Yes ma'am."
Minerva continued. "You will be respectful of all students needs, you will explain completely what the potion is, does and why it is to be brewed the way you explain. If not you are out. I will not see anything like this again.
You are also relieved of head of house. I will inform professor Sinestra, that she is now head of Slytherin house. Any points or detentions you assign must approved by the student's head of house. You are on very thin ice Severus. The house elves will move you to your new quarters. Now get out of my sight!"
When Snape departed, Minerva reached in her bottom desk drawer pulled out a bottle of single malt scotch poured five fingers in a glass and drank it straight down.
Snape stormed through the castle, he had never taken a dressing down like he had today and it was all Potters fault.
Harry and Hermione were planning their next raid. It was very simple the Malfoy home would burn to the ground it would take place over the weekend.