I was going to save this for some other post, but (Probably evident by the amount of notifications you're likely getting from me, sorry) I got bored and have been exploring your blog, so I may as well dump them here...
Timestamps I marked because I noticed a couple things:
1:38: I know Fire Nation guards and soldiers are frequently portrayed as anger driven and ineffective but what in the Stormtrooper ass fuck was that aim?
2:48: Azula used a low spin kick whilst firebending as her first move. A move usually associated with Zuko. Well played.
3:06: If we are to assume Ty Lee and Suki are fighting on one half of the gondola, it's kind of odd they animated Azula's flame nearly hitting Ty Lee when Zuko's been busy parting most of her attacks. Unless she was aiming for Suki but... that was a very miscalculated blast. Probably just a minor animation detail added in to keep things tense without focusing on the positioning of the fight. (Or it'd been originally intended to be Zuko's?)
3:23 - 3:28: I like to imagine Zuko and Sokka had a momentary pause here in sheer awe of her planking like that. In those five to six seconds they could've easily driven her off the gondola. Especially with how violently they were trying to drive her back just seconds before.
3:39 - 3:48: Them prioritizing someone below the rank of royalty's orders over the lives of both their possible throne heirs is likely a writing oversight. But, let's be honest, Ozai wouldn't be above allowing for this to happen.
4:07 - 4:36: Zuko and Sokka tenderly holding hands or something for half a minute, for some inexplicable reason.
4:12: Azula's momentary loss of balance.
4:13: Just a good line read for Ty Lee's panic. Oh, and Azula being in disbelief and having to see for herself if it's true.
4:21: Azula's genuine panic.
5:53 - 6:00: I don't know why this part is always so amusing to me. The gondola spits out Suki, Sokka, Zuko, Hakoda and lastly, Chit Sang, who brings the warden out with him... then Hakoda just points back to the gondola and the warden gets thrown back in. The little point always gets me.
6:35 onward: Now for the good stuff. Azula's dialogue is as follows:
"Leave us alone." To the gaurds.
Then directly to Mai: "I never expected this from you. The thing I don't understand is why. Why would you do it? You knew the consequences."
None of this was threatening or aggressive. Her tone and expression are tight, sure, but not hostile. She even softened/faltered for a moment when asking Mai why she did it. She wants to understand. So what if it's treason? She's willing to hear Mai out here.
Mai tells her in response: "I guess you just don't know people as well as you think you do."
Azula remains calm and patient. She's not even offended by nor challenging this claim.
Then, the knife to her heart:
"You miscalculated. I love Zuko more than I fear you."
She seems to react at the point where the words are "I love Zuko more" specifically. Ouch.