The person is looking back and forth between the other person's eyes.
Why.
Instead of asking the internet, ask someone who actually did it.
What?
It's like saying "hey, can you tell me why this guy did this thing even though even I don't know why?"It's not like we're psychic or something, even though it is kind of obvious anyways.
...what?
I think JD is unaware that everyone does this, and assumes Warren is asking us why some random person did it.