Gendry was working at Tobho Mott's establishment, making some swords. The tall, strong boy was sweating a lot, obviously because he was in front of the big furnace and because of the physical exertion he was doing

The clanking of the metal of the hammer against the metal of the sword he was forging flooded the entire place, echoing through the room and not making him notice that someone had entered the place, continuing to work hard