Firemorp is a firebender that's been turned into a Xenomorph.
The Fire Nation fired more bombs towards the air temple, Aang used air bending to close a series of doors around the temple. The doors remained in tact until the stone ceiling started to collapse, a large piece of stone fell towards Katara as Zuko pushed her out of the way.
Katara: What are you doing?
Zuko: Keeping rocks from crushing you.
Katara: Ok, I'm not crushed, you can get off me now.
Katara got up and ran towards the back of the temple.
Zuko: I'll take that as a thank you.
At the back of the temple Toph & Haru made a cave in the wall, Zuko remained as the others headed towards the cave.
Aang: What are you doing?
Zuko: go ahead, I'll hold them off. I think this is a family visit.
Zuko ran towards the airships to fight his sister.
Aang: Zuko, no!
Sokka: Come on, we've got to get out of here.
Sokka & Katara helped Aang get Appa to the cave as Zuko shot a blast of fire towards the soldiers firing the bombs, but Azula raised from the fog in a forth airship along with two Xenomorps in Fire nation armor.
Zuko: What are you doing here, and what happened to your hair?
Azula: You mean it's not obvious yet? I am about to celebrate becoming an only child! As for my hair.
Azula fired blue fire from her feet as Zuko dodged but still got blowback by the impact, the temple started crumbling down as Zuko used his skills to jump atop the airship.
Azula: I'll deal with my brother, you two find the Avatar and his friends.
Both Firemorphs: Yes your majesty.
The Firemorphs jumped towards the air temple as Azula jumped down from her post and saw Zuko fall towards the fog, the Firemorphs got to the cave just before the temple fully collapsed.
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The gang was trying to get Appa through the tunnel but he kept resisting, the creature was obviously not fond of being underground.
Aang: I can't get him to go in there, Appa hates tunnels.
Katara: Aang, there's no way we can fly out of here.
Aang: We'll have to find a way.
Just as Appa was starting to move the two Firemorphs jumped on top of him as he began to try shake them off. Aang airbended them off as they hit the side of the wall, the group minus Toph stared at them.
Teo: What in the!
One of the Firemorphs ran towards the group shooting blasts of fire at them, the other climbed up the wall to try to take them by a surprise but was stopped when he noticed three red dots moving towards him. He turned to see Wolf aiming his shoulder canon at him and stopped when the dots were on the Foremorphs head.
Firemorph: oh shi-BOOOOOM!!!!!!
The blast caused the cave to crumble as Toph tried to stabilize it.
Toph: Hey Metal Face! Are you trying to bury us!?
Wolf: I apologize.
The other Firemorph witnessed his partners demise and shot fire towards Wolf, the Yautja dodged with ease and threw three shurikens towards the beast. The Firemorph ducked and began running towards Wolf as the warrior moved to the side, extended his spear, and impaled the Firemorph and pinned him to the ground. Wolf quickly grabbed the serpent by the head and raised his SmartDisc, he used it to decapitate the Firemorph and raised its head high, he let out a roar of victory as the gang stared at him.
Wolf: What's so wrong with a hobby?
Teo: There's so many questions I have about you.
Suki: So what's our plan of escape?
Sokka: We need to split up, take the tunnel and get to the stolen airship.
Katara: No, the Fire Nation can't separate our family again.
Hakoda: It's not forever.
Katara let out a few tears and gave her father a quick hug, she ran towards Appa as Suki & Sokka followed. One group ran deeper into the cave as the others climbed Appa with Wolf. Toph placed her hand on a piece of stone on the wall.
Toph: I can clear that away and we can fly out through there.
Suki: Um, there's an awful lot of fire in that general direction.
Aang: We'll get through, let's go.
Sokka: Do we really need to bring him?
Wolf: What's so wrong with me?
Toph: You did try to kill me.
Wolf: That was Brielle, and she spared you.
Suki: Let's just fly.
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The gang managed to get past Azula with a stone shield as Zuko revealed to be on another airship, the siblings fought as Fire Nation soldiers shot at Appa. The siblings eventually got close enough to speak but still fought.
Zuko: I saw those creatures in Fire Nation armor, what are they?
Azula: The next generation of our warriors, with them father will be untouchable!
The two then punched each other with a fist on fire, the impact blew both off the airship as Appa caught Zuko as Azula continued to fall.
Zuko: She's not gonna make it.
But then Azula used fire to push herself towards the cliff and grabbed onto the side.
Zuko: Of course she did.
Wolf: I must say, that girl is full of surprises.
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Brielle, Mai, and Ty-Lee remained in their cell, Brielle has been starring at the back of the cell ever since they took her Bio-Helmet.
Ty-Lee: If you two are really friends, shouldn't you be talking more?
Mai: We're not actually friends, I just said that because I was sure she'd be able to kill Azula.
Brielle: Well no one said anything about surprise lightning attacks, I should've just killed you when I had the chance.
Azula: So now you decide to talk.
The three turned to see Azula with a Fire Nation guard.
Azula: I must say that your strange transformation liquid is truly magnificent, imagine what the Fire Nation can do with the rest of your we-
Brielle grabbed Azula's arm as the guard threatened her.
(1:30-1:44)
Guard: Hey, let her go.
Brielle: I might just break it.
Guard: Let her go.
Brielle stared into Azulas eyes and let go, Mai walked up to Azula.
Azula: Mai I-
Mai grabbed Azula by her collar and pulled her head into the bars, Azula stood back up and stared at the two with intense anger.
Brielle: So how's you hair, your Majesty.
Azula yelled to herself and walked away, Brielle and Mai looked at each other and smiled to themselves.
Both: Nice one.