Sasori had tuned the two others out already a good while ago, and was now running around in his own head, trying to figure out where Deidara would hide in Konoha if he was wounded. The first place coming into his mind was somewhere high, but then, remembering that the blonde wasn't (completely) stupid, he guessed it was low; maybe in an abandoned house or underground.
If Deidara wasn't inside the walls and outside instead, he would be hiding under the ground or in some kind of cave. But, as far as he knew, there weren't many mountains outside of Konoha, only the one with all those faces on, but he highly doubted that Deidara was there.