The moment he scents the tang of rust, Skyfire's ears perk a bit and he sniffs at the air again to make sure. "I can smell rust, and I believe it's coming from that direction." He turns towards the scent and moves to follow it. Having the ability to track light, almost nonexistent odors came in handy sometimes.

He did pause a moment when Tsukishima mentioned getting lost and looked sheepish a moment. "Ah, as long as we don't go running around blindly we should be fine." Turning a bit so Tsukishima could see behind them, where he could see that Skyfire had been marking their path with small arrows gouged into the stone floor or walls as needed. They weren't large or deep, but he thought they should last long enough to help them find their way out later.