Clark lets him go, because now that Bruce is moving, now that he's angry, Clark allows himself to put the pieces together. Realistically, it only takes a few milliseconds for him to come to his conclusions, but he's well-practiced with taking the right amount of time. Knowing the ebb and flow of conversation so that Bruce has had enough time to breath before having to listen to him or consider his words.

"Well," he says quietly, nothing in his voice to indicate any kind of response (because he needs to know the answer before he knows what kind of response to make)... "what I'm getting from all that is... either you're dying... or you're more worried about coming in green than coming in grey.

"Is it up in the air? Or do you know?"