Harry had just gotten dressed and was running down the hall to get to Potions class, he knew that if he was even a minute late Professor Snape would be furious. He thought he would make it in time but he was wrong, he was about five minutes late. Harry hesitates to enter the class but skipping it would result in worse punishment. As he entered, the whole class turned around to stare at him and so did Professor Snape. "Well, what have we here? Mr. Potter" Said Professor Snape bitterly "I do expect a reasonable explanation to why you are late." "No, sir" Answered Harry. "That will be ten points from Gryffindor and meet me at my office after lunch for your detention." decided Snape with a loathing look.
Where were you all morning?" asked Hermione after class with a demanding look "I-I..." started Harry but he couldn't finish, Hermione wouldn't approve of what he did so he decided to just lie. Harry cleared his throat and started again "Ron didn't wake me up, I just woke up" , he suspected that Hermione hadn't believed him but she didn't say anything about it , instead she steered away from the topic "I wonder what's wrong with Professor Snape!" she said . Harry didn't seem to understand what she meant "What do you mean?" he asked, "He has been stuttering and he looks paler than usual." she answered "I didn't notice anything; he looked perfectly fine to me" said Harry "Well you don't usually pay that much attention in class so I don't really expect you to notice.".
Harry makes his way to Snape's office after lunch and hopes his punishment won't be too hard or bad it's no secret that Snape hates Harry and would grasp any chance he gets to make Harry's life more miserable. When Harry arrives at Snape's office he notices his potions master is certainly looking paler than usual but ignores it anyway thinking that Snape is an adult and he is capable of caring for himself in case he was sick. "Potter , to serve your detention you will have to brew a swelling solution" said Snape but Harry noticed that he didn't have the loathing look he usually sports but instead he looked like he was having trouble focusing his vision and was slightly stuttering.
While Harry was crushing dried nettles and pufferish-eyes into a medium-fine powder, Snape was wandering around his office in an attempt to make Harry more nervous. Harry didn't think a swelling solution would be very hard to make as he learned it when he first got to Hogwarts. After adding all the required ingredients to the cauldron and following all the steps , Harry left the solution to brew for an hour "What should I do while waiting for it to brew , Sir?" he asked and started walking up to where his Professor was standing "Start working on a forgetfulness potion" said Snape Dryly .
Harry was halfway through with the forgetfulness potion when he heard a light Thud behind him; he turned around to find Professor Snape leaning on his desk for balance and noticed that he went even paler. "Are you alright, Professor Snape?" asked Harry worriedly "it's none of your business Potter but I'm fine now get back to work" said Snape bitterly. Harry wasn't about to believe that, you don't go pale as a ghost and lose your balance when you're fine but he went back to work anyway. A few minutes later Harry was done mixing the ingredients of the forgetfulness potion and put it to brew then he turned around to check on his swelling solution, he sneaked a glance at Snape who looked at his worst now and decided to help him even though he was his least favorite teacher. "Are you sure you're alright, Professor?" asked Harry in a more concerned tone than the first time "Ye...Yes I'm f-i-ne" said Snape "You look pale!"
Snape was getting very dizzy, he was stricken by a wave of nausea and he was starting to sweat. I can't be sick he thought to himself not now , I can't admit to weakness in front of Potter...but I can't help it I'm about to collapse maybe I should just tell him. "Potter , could pass me a cup of water?" asked Snape quietly , Harry was getting more worried by the moment and Snape asking for water was definitely not a good sign since in any other situation he would have used magic to pour himself a cup of water , this meant he wasn't feeling strong enough to use magic .
When Harry turned to pour Snape a cup of water, he heard a loud Thud. Harry hoped that noise was not what he thought it was and so he immediately turned to find Professor Snape collapsed on the floor of his own office, completely out of consciousness. Harry hoped that Snape hadn't hit his head on the desk while going down. Harry hurried to his side and considered lightly hitting him in the face to get him to come to but thought better of it, so he got a cup of water and splashed some of it in his face to no avail "Professor, Professor! Can you hear me?" shouted Harry in a panicky tone but Snape lay motionless on the ground.
Harry hurried to the door of the office and pushed it open, he ran down the corridor trying to find any other teacher and to his luck he spotted both the Headmaster and Professor McGonagall passing by. "Headmaster , Professor ... the dungeons ... fast" shouted Harry between breaths "Calm down Potter , what have you done this time?" said Professor McGonagall "Nothing , it's Professor Snape he just collapsed and he might have hit his head on the desk while falling. Hurry up please" Harry urged them. Both Dumbledore and Professor McGonagall were now very worried and were running back to Snape's office with Harry.
Dumbledore kneels down on one of his knees and tries to wake up Snape but he gets no response so he asks Harry to fetch Madam Pomfrey. Madam Pomfrey arrives five minutes later along with Harry "I've been working here ever since Snape was a student at Hogwarts and up till now he has never fainted , this was not something I was expecting to see. I hope it's not serious"