The sounds are not any different from ones used in the military, though the purpose is different.

[ These ones aren't used to signal their allies, for one.

Though she thinks she understands now. He wasn't hurt, he was scared. Of course, it's just a guess, and it would be very rude of her to straight up and ask. So she'll try and explain a little bit, for Yoimiya's sake. ]

Yoimiya makes fireworks for a living, and we work together back home during festivals and other events. Everything she makes is just so beautiful, but it is not very often that I get to witness them like this.