I think usually there’s a built-in mechanism you can switch up top to keep the door open, or at least there was where I used to live.
Either way, the emergency exit doors are purposefully designed that way to keep the fire and smoke from spreading, and fire fighters always carry tools with...
Kyouko is definitely not dead, cause if Yume only needed a sacrificial pawn, any of the hundreds other gray workers would’ve sufficed.
Most people seems to think Yume is more cruel now, but judging from the previous job, I definitely think she still retains her humanity.
The mangaka definitely does not know how to write kids. How tf did they start a fire, build barricades, know to strategize take downs in order, and even count the rounds. They’re better than most survival experts, while the adults couldn’t smell the gasoline being poured down their legs.