Yamato tenses up a little as they move, but he relaxes pretty quickly once they stop.

"The whole running up walls thing is pretty cool," he says, conversationally, switching the map to a blueprint of the building.

"Okay, the maintenance shaft is near the centre of the rooftop. It's narrow, but we won't be in it for long," he says, crossing the roof until they eventually reach a slightly raised section with a trapdoor set into it. It's locked, but it doesn't look that sturdy. "If you'd like to do the honours."