It's also possible that it was Snape, in a more complex scenario. Although he is the potions master, he might have unknowingly set up a situation where Harry collapses. For instance, if he assigned a particularly difficult potion that was too much for Harry's current abilities, and due to Snape's strict and unhelpful teaching style, Harry couldn't ask for proper guidance and eventually collapsed from the stress and difficulty of the task.
It could be Malfoy. He often has a vendetta against Harry and might have found a way to make him collapse during potions class, either by tampering with his ingredients or distracting him in a way that leads to a mistake in the potion - making process.
A new, mysterious character could be responsible. Maybe there's a new student or a hidden enemy in the school who has some ulterior motive against Harry and decides to target him during potions. This character could have used a very subtle form of magic that's hard to detect, like a charm that slowly affects Harry's strength as he works on the potion.
The best chapter pointer here is Chapter 148, "None are Normal". It opens with Exiting the cottage, Director Sun picked up the phone. and closes on Just as Jiang Li put down her chopsticks, she received the call from Mr..
Look to Chapter 109 for the clearest answer. It begins with And another thing," Jiang Li said, taking out a tissue to wipe her lips,..., keeps building through The next time we have a meal, don't try to chat with me unless you're fine..., and lands on [You're indeed more likable than me, the type.
The best chapter pointer here is Chapter 77, "Why are you sabotaging me again?". It opens with Wen Jiaojiao's reminder calmed Shu Yan down. and closes on But who knew that the next second, the lottery box would be handed over to....
Look to Chapter 129 for the clearest answer. It begins with When they saw that the live chat was full of praise for Jiang Li, those..., keeps building through Had they been used as pawns by publicity accounts?!, and lands on With that thought, he smugly turned on his phone..
A practical answer is Chapter 132, because it turns the idea into a concrete scene. The chapter opens with The new girl in the live-streaming room went crazy., adds pressure through Stay away from my fragrant and fresh Brother Daniu!] [Not only has the..., and ends on He stir-fried the other.
The best chapter pointer here is Chapter 154, "He Came, Bringing with Him the Bastard Game". It opens with Hahaha, I'm dying of laughter, Lili, do you really have to be so blunt?"... and closes on Helplessly, Director Sun could only grit his teeth and add another 5....
Look to Chapter 133 for the clearest answer. It begins with Watching Jiang Li and the others finish their meal and tidy up the table,..., keeps building through But when he went to the firewood shed to find a convenient wooden tub, he..., and lands on It was only after she shared the concept and.
Chapter 131 is the strongest chapter-level answer because it starts from Just around mealtime, Director Sun came over pushing his small food cart. and follows through on Hungry, they no longer cared about their appearance, quickly washed their....
The best chapter pointer here is Chapter 105, "He Yun, let me give you a reading". It opens with But this did not elicit any sympathy from the woman on the phone; on the... and closes on However, the next second, things took a turn..