Second you can run through the mobs to the south exit. The only issue with this is sometimes the game crashes when you exit this way with Thorald. If you do this then you should have no problems as all the enemies are still trying to path back to you. After you train everything to the South of the map, then run by them, healing yourself and run as fast as you can to find Thorald. Run inside and train every enemy to the Southern entrance of the keep. Go to the north entrance to the inner Keep. You can aggro them, but don't attack them. It is possible to do this mission, saving Thorald, and not incurring any negative Failed missions. None of this should be shocking, as the quest can also glitch up if you exit the wrong door, or pickpocket and ask questions in the wrong order. Maybe next time the Thalmor will learn to just agree when two people show up at the door wreathed in flames and wearing the bones of dragons they've slain. You can still complete the quest, as I did, by failing the no bloodshed portion and saving Thorald with force.
That's possible, especially at higher levels, but as far as I can tell there's no real benefit. Nope! The only way to avoid bloodshed (at least as of the current version) is to just not fight back. Siding with the Grey-Manes/Battle-Borns when you enter Whiterun - This just has minor effects on dialogue within Whiterun.Adding the Imperial Order via console - Doesn't change the Thalmor's dialogue options.Completing the Imperial Legion questline - Tullius still says no.Light or Heavy Imperial Armor - Does nothing.Legates wear the heavy version of Imperial armor. Imperial Legionnaire Armor - Doesn't exist, of course.To do it, you can try one of the following: