Flain was five years old and had not met Denji yet, so he was an obedient slave.
One of the guards was watching him from behind to make sure Flain kept mining and didn't rest. There wasn't much of Flain visible from the outside because the small hole didn't offer much space for observation, so only his legs and the sound of his pickaxe could be noticed.
Still, the guard wasn't really paying close attention to Flain, because all the guards knew that Flain was an obedient slave and never caused any trouble, so the guard treated it as a paid break.
Flain mined and mined and mined, a focused expression on his face. His muscles were swollen due to the effect of the stimulant powder he was required to take before mining.
Flain continued mining until he hit something – a small metallic spike sticking out of the wall. Flain was sure it wasn't radioactive iron because it glowed a pale green color.
