To arrive at such a conclusion was easy. Lith could accurately gauge who's doing it was, and what the tool used was too.
Iron, when heated, had a somewhat rough texture. It wasn't heated to the point where it would melt, but enough to hurt somebody superficially.
It was a pipe and not a solid rod because the gush wasn't deep. Rod weighed more and could cause deeper damage.
Like moving a feather on a skin, the person must've traced the boy's body with the iron pipe.
The boy had clothes on and wasn't naked, but Lith could figure out that the scar ran through the lengths of his body, meaning he was stripped, tied, then tortured.
The boy that looked no older than seven suffered through such hardship. It pained Lith's heart. It really did this time.