I read this post on IMDB at the time the episode had just been filmed, but of course at that time we didn't have access to post here so I decided to save the info until the episode aired.

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POST FROM IMDB SITE by meangeoffmeed 9-12-09

Re: "Black Gold & Red Blood"  NO SPOILERS.

We were going on our 14th hour of a long day on a Friday night before the weekend, and he was STILL, the nicest guy, having a good time working, very, VERY rare, among series regulars who often are very cranky from the moment they get to set, and then moan and groan all day about wanting to get out of there and go home. a great guy.

No idea what most "stars" are like, despite all that money they earn, all the stardom they have, etc. NO idea .

I only worked with him all day. All our scenes took place inside a prison, so none of the other cast were there. but it seemed like a good show judging by the crew.

http://www.imdb.com/name/nm0576015/