"Good afternoon, Harry," said Dumbledore. "What are all of those flour bags for? We baking a birthday cake or something?"
"Good afternoon, Professor Dumbledore." replied Harry. "To answer your question, I have no intention of baking birthday cakes or doing anything of the sort."
"Then what are they for?" asked Dumbledore.
"Professor, since you are a magic teacher, you may not know what this is, but have you heard of the term 'dust explosion'?"
"I am not familiar with Muggle science," said Dumbledore.
"Dust explosions happen when fine particles in the air suddenly combust within an enclosed space, due to some spark or something. This creates a huge explosion, and sucks up all the oxygen. In an enclosed space like Hogwarts, a dust explosion can instantly turn this hallway into a vacuum," said Harry.
"Wow, that's very educational, Harry, but what does that have to do with the flour bags you have there?"
"You see, Dumbledore, this flour plays the role of the fine particles."
Harry suddenly slammed the flour bags into the ground, dispersing the white powder everywhere. He pulled out his wand before shouting "Ventus!". A gust of strong wind blew the flour down the hallway.
"Harry, what in the world are you doing?!"
Harry did not answer this question. Instead, he uttered only one word: "Confringo!"
In an instant, the hallway was consumed by a scorching inferno.
That was the day Dumbledore experienced firsthand the power of a dust explosion. Considering that thermobaric weapons, the most powerful non-nuclear weapons, were designed based on the principle of dust explosions, Dumbledore likely did not survive.