Bruce is in his apartment, which means at least a small portion of his senses are focused on the man. When one considers that he's shrunken his focus to a single city for the most part, and that that attention is no longer focused on picking up crime while he's here, Clark has an ABUNDANCE of focus.

And it's Bruce. In his apartment.

He looks up and over at Bruce before Bruce even speaks.

"You know I'm always happy to help you, Bruce."