"Ahh--!! Okay! Thanks! -- Uhh..." That means, maybe, the root isn't totally found yet. There's more to it. He spreads the star chart out on the ground in front of him, running his finger over it searchingly.

"Draco..." Merlin had mentioned it earlier. It was probably significant to this memory. Even if it wasn't, it couldn't hurt to look. "Draco, Draco... is... here."