Robin and Rowan were engaged in a staring contest as a result of what Rowan saw on the screen. He expected Robin to open up and say something to either confirm or negate what he had seen, but Robin wasn't speaking.
Rowan couldn't believe that the public enemy who got everyone worshiping him for solving a case that even the police couldn't be the very person he always called a wastrel. How on earth could Robin be the public enemy?
Many more questions were running through his mind, like when was it, when did it start, how did it start, or even, why did it start? There are too many questions to answer, and Rowan only had a wish for Robin to explain things to him.
However, there was no explaining it, as Robin wasn't willing to speak up. As a result, Rowan took a seat and kept looking into his cousin's face, like they were involved in a staring contest.