Note: this is my own version of the battle of Shiganshina and Liberio and some twists on the way titans work,
I am not an expert on Attack on titan this is purely for fun
The battle of Shiganshina
Eren and Armin are fighting the colossal titan.
The armored is already taken out and blown up, Armin is being burnt alive by the steam while Eren attacks from behind, slicing the neck of the colossal titan.
Eren pulls Bertholdt out of the colossal titan but seeing his best friend Armin being burnt and falling to his death.
Eren realizes he cannot carry both Bertholdt and Armin down
so, in frustration, he throws away Bertholdt's body and gets Armin but without realizing Eren threw Berthold towards Reiner
who had regenerated just enough to speak a small amount
Berthold says to Reiner "we can't win like this we've already lost unless we use our last card." NO! Replies Reiner. "We can't do it and even if we wanted to you can't transform anymore and I can barely speak let alone that. "We have no other choice replies Berthold. You have to eat Me.
you have to regenerate quickly. Once you are done you will be the most powerful of them all. You will become an honorary Marleyan said, Berthold.
Reiner screams in anger, rage, and pain and he pulls every ounce of his strength to regenerate and suddenly the armored titan is standing back half regenerated, Eren and the rest notices as the armored screams out in pain as he throws Berthold into the air and yells "TO BE AN HONORARY MARLEYAN"
Berthold falls into his mouth as he comps down
everyone realizes what has happened and rushes over before they step back knowing what's going to happen
as yellow lightning strikes over the armored titan, suddenly he isn't the armored titan anymore but now they see the armored colossal titan
they try to attack but don't know how he may not be bigger he is still 60m but now he has armor
in the meantime, Levi has taken out the Beast titan and they want to save Erwin and Armin but they can't save either of them as they don't have a shifter for them to eat,
Reiner wants to attack them but he is too emotionally destroyed so he can't
instead, he uses his steam to its limit to immediately burn through the entirety of the titan's body so he can escape with the cart titan and Zeke back to Marley