This is how you conduct a sideline interview during a game. Both guys playing up their personalities (or lack thereof in Greg Popovich's case) with a surprise twist at the end. It was like a 30 second episode of 'Curb Your Enthusiasm'.
The fact is, Jeff Van Gundy and Greg Popovich have been friends for 30 years, they're just having some TV fun.
Van Gundy: "If it was a close game he would've punched me."
If it was Craig Sager doing the interview, Pop may have actually punched him in the face and slowly sauntered off like nothing happened...either that or stone-faced the entire interview and not said a word.