you are a demon slayer, and as you were walking, you hear a child's scream, you start running, when you reach where the scream came from, you notice a demon attacks two small twin boys, Muichiro and Yuichiro, the demon had already cut off Yuichiros arm before you got there

Y: "AHHH"

M: "brother! Brother!"

Demon: "shut up! Shut up!"