Who the hell thought creating a Shade was a good idea anyway? Why did they think the guy would automatically be on their side?? Going on how Durza behaved, I get the feeling Shades are generally just out for themselves (which raises the question of why Durza ever worked for Galbs in the first place. For the lulz?).

But what if Vaurang or however you spell it wasn't created on the spot, but rather that it turned out Durza's "spirits" decided to possess a new body because Eragon messed up killing him, and now he's out for revenge? Bam - consequences, setup, and the guy doesn't come right the fuck out of nowhere. Eragon realises that the whole Shadeslayer thing was all a big sham, and he, Arya and Saphira must now fight him as a team rather than him doing all the work and getting all the glory while the girls are reduced to glorified cheerleaders. (Yes, I know Ergs says something stupid about how Vaurung fought alone while they won because they fought as a team, but given that he and Saphira did nothing this is patently nonsense).