Sounds good, I would also like to find a way to get Thurdack into Waterdeep. Being a barbarian its not too often that they like to walk into the greatest city in the FR.
So how about something starting from the destruction of the orcs at the hands of Murtek and the Red Knight. Something like -
Thurdack and his new brothers, the Uthgardt, trailed the orcs for days. It seemed odd that the orcs would travel so far from their homes far to the north. Perhaps they feared the retribution of these warriors he traveled with. One night the scout of the tribe, a warrior named Krem, saw a fire burning brightly down in the valley below. Skirting the edges of it he could see that they had finally caught up to the orcs. Why they dared open fire knowing they were being tracked was beyond Thurdack, perhaps they thought they had escaped. Regardless the brothers armed themselves for battle. This was the first time Thurdack had seen them paint their faces. Once ready the offered a prayer to the Raven, the manifestation of Uthgar that the tribe followed.
They broke into a light run as they headed down into the valley. As they neared the fire they saw that it burned much brighter than Krem had described. Breaking into a run the burst upon a scene that none had thought possible. All of the orcs lay dead many of them burning upon the fire as if it were a pyre built especially for them. Among the bodies stood a human, fresh blood flowing from his wounds as he worked methodically at stripping and burning the bodies. From the looks of it he had killed all of the orcs singlehandedly.