Yep it's all Sam, I'm sure he is used to teaching his chefs BIR cooking,he has a natural gift for teaching his trade.
Chris is standing behind the counter next to a small camera on a tripod, it's placed on the counter top for stability. I have to give a credit for the editing and film quality to Chris, also for getting us inside SAMs Takeout but I think Sam could of bridged this gap if he felt inclined to do so.