Saw Brandon this morning!
Yes, Praetor Quintus himself! I was at the local ComicCon with my brother and sister, when she spotted him. After we realized that was who it was, our collective reaction was, "No. Way. It's actually him!"
One thing we asked him was what his favorite scene to film was, and he said it was the interrogation scene from S2E7. "Flesh & bones." (He couldn't remember the episode, but remembered it as "between [him] and [Jonathan]") And did he have a story!
He said he thought he had a full week to memorize his lines, but last moment they decided to shoot the scene a week early. So he just had ONE NIGHT to! They shoot the scene... to his surprise the crew was all there.
In his own words, (tail end of the scene) "that was fun."