It's an extreme reaction, especially from the normally placid and calm Linden. He simply doesn't emote as freely or frequently as others, and it's clear from every indication that he needs this desperately.

He chews at the tip of his finger, worrying and gnawing at it while Phillip moves. He returns it immediately, and within just a few more moves, the game is finished with a softly spoken "checkmate" from Linden.

Standing when it's done, he stands and walks across the room, reaching into his jacket for a carton of cigarettes, hand shaking as he lights one and draws on it silently.