1) Yet another different version I hear... Look now, Thrall was never short on honor and he would never cheat and break the sacred orcish duel's rules! Him wearing armor in the duel is simply a blooper of the guys who made that video.
2) Durotar was the perfect place for the Horde to be: 1. left alone; 2. atone for the invasion under Gul'dan's rule; 3. regain the trust of the elements. Guess what, they were left alone and later became able to commune with the elements. And let me remind you again - these guys are not from this planet! They don't really have too many options. Thrall made the absolute best choice!
3) These guys both forced the elements. The idea is for the elements to willingly lend their powers - that is true shamanism.
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Mehrunes , please check what I wrote above, they mostly answer your comment as well, apart from Thrall's mindset part, to which I write now: Thrall and Garrosh are 2 sides of a coin. Thrall has always strived towards peace, although he has more reasons than Garrosh to hate the Alliance and humans in particular, while Garrosh has always been too full of bloodthirst, always longing for battles. So what if the Horde was short on supplies and trying to resolve matters peacefully? Thrall's reign at least did not go full on retard warmode. In fact, Thrall built everything that Garrosh tried to destroy with a light hand.
And regarding Varian, shortly after returning from his abduction, Jaina arranged a meeting between him and Thrall in Theramore. Both Thrall and Varian did not like the idea, but they put aside their differences and attended it. They even reached a point where they discussed how the Horde was short on wood (hence the existence of WSG) to which Varian responded that he could trade wood in exchange for copper and exotic hides from the Barrens. Shortly after the meeting there was an invasion of Theramore where alliance representatives of the Twilight Hammer attacked the Horde and Horde representatives attached the Alliance. So Varian thought this attack was orchestrated by the Horde while Garrosh accused the Alliance, and so the idea of peace died there.
The movie was a complete joke when it comes to what actually happened in the story of Warcraft.