Duke stops to watch the figure of a humanoid - it looks like a human enough, but he's not close enough to really tell exactly - propelling themself through the sky not by means of levitation but by odd orange fire. He tries to track the movements that cause the changes in direction, speed, but at the distance... not so much.
One hand twitches, as if he was going to pull on some strings that should have been right under his fingertips, but... a grimace and staring at the shackle. He can't get to the sky right now, take notes his preferred way, or try to sense what the other was doing.