This person our boy Saurfang goes to visit is Thrall. He was the warchief that established the horde as they are today in Warcraft 3. He stepped down in the third expansion (Cataclysm) in order to basically go be Green Jesus and save the world. He was around helping out for big events, but he was largely out of the picture after Warlords of Draenor (fifth expansion). He is a good guy. We like Thrall.
HI. I came across the vid and your others for WoW while just browsing YT and to be honest watching other WoW reactions. I gotta admit I did not (yet) watch all of them fully, but while I think BfA is an ok start I really do think you should really consider starting with WC3. And I don't mean watch the cinematics. I mean invest the 10 bucks and the 2 days to get the game and play the campain cause it is worth it. It is sitll one of the best narative campains and sets the stage for all of the WoW cinematics. Should you do or consider doing that I gladly provide a detailed cinematic and even ingame cinematic list to follow the actuall story line if prevered even with further detail.