There's a brief look of mild embarrassment on Quinton's face as Ser Timon mentions his strikes on Ser Joren, the young man averting his eyes a moment or two after he catches Ser Timon's glance. Only once Ser Timon starts asking Ser Joren direct questions does the boy look back to The Fox, expecting the man to be a bit more forthright than he has. Quinton, for his part, does not seem particularly engaged in the interrogation of Ser Joren - merely present to attest to what was asked and said. The only visible sign of interest out of Quinton is the mention of Harrenhal - a place he had heard of many times in tales of Aegon's Conquest and the rumors of it being cursed. It seems fitting such a place would be used for treachery. Regardless, Quinton remains quiet on the topic as he watches The Fox give up the depth of his knowledge.
When Ser Joren has finished answer Ser Timon's question, Quinton looks back to his superior with an inquisitive look - eyebrows arched as if silently questioning whether Ser Timon believed him or whether the answers were sufficient.