Gomi Ika da to Tsuihou Sareta Shiyounin, Jitsu wa Zense Kenja desu ~Shijou Saikyou no Kenja, Sekai Saikouhou no Gakuen ni Kayou~ - Vol. 2 Ch. 10.1 - …

[Kaarme]

I mean there is a window right there. Why didn't he just hold his hand out the window when he cast the spell?

Because in that world, getting the title sage does not assume one has any intelligence or wisdom.

 

[galaxia9]

Oh, don't worry, fire inside is never a problem. There's rule breaking and there's stupidity.