Saurfang has a long history of serving the Horde. The good and the bad. He’s not a young Orc anymore and he didn’t intend to get captured. He intended to end his long service the most honorable way he knew how. In battle. He intended to die. He didn’t count on the Alliance not killing him.
But, he isn’t dead and he’s continuing to serve the Horde the best way he knows how and right now that’s a tenuous truce with Anduin.