Believe the stones...

Please excuse the graphic nature of this description. I tried to put it delicately:

Stones refers to testicles. If one has big stones, he is said to be more masculine, or act tougher. We also use the term brass ***** to refer to them being hard, hence tougher.

But is Joe refering to Clark being tough or to the shot cop?

It's hard to be sure; I'd have to watch the video. I assume he's talking about Clark, because he says "good for you." Was there a third person in the conversation? If he was looking at the third person, he might have made some gesture when he said 'this guy'.

Old Man GordonIt's hard to be sure; I'd have to watch the video. I assume he's talking about Clark, because he says "good for you." Was there a third person in the conversation? If he was looking at the third person, he might have made some gesture when he said 'this guy'.

Here's the clip below. Just to know I've messed up the names.
C

Yes, it seems clear he's talking about Clark. He turned to his buddy, but looked at Clark when he said it. The remark is both a compliment and a warning that Clark is talking very tough. Clark was saying that being brave is a requirement for cops, so bravery is nothing extraordinary.

Thanks, Old Man Gordon!