Selling Rocket Fuel?

Arad gave the liquid hydrogen bottle to Gojo and pulled a second one for himself, alongside a new set of oxygen bottles. "Let's send it." Sparks of fire flashed from Gojo's finger as Arad did the same and both of them fire [Fire bolt]s

As the spells impacted the ground, they flashed with a bright light, growing into a massive blue rose of fire, followed by a booming impact and a shockwave that blasted the teachers running toward Arad and Gojo's location.

"What did you do?!" The teachers managed to reach them as the dust settled.

"Testing components." Arad replied.

"No component would do this!" A teacher growled, and Lucia tried to stop him. From what she saw from Arad, she could believe his words.

"Want to try it?" Gojo approached them, smiling. "My little brother is an impressive alchemist."