This looks like a good way to use a grill to smoke a boston butt pork roast for making pulled pork. We like the way that the coals are separated on either side and added to during the smoke. The cook mops the butt with his mopping solution throughout the smoke to keep the butt nice and moist.
Eventually the cook gives up on adding briquettes to both side and concentrates on maintaining only one side of the grill. In the end the butt is smoked on the grill for 12 hours and is easily pulled and eaten.
What do you think the purpose was for, or why were the 2 chunks of wood setting on the grill grate in front of the Boston butt?