"Prometheus!? Napoleon!? We are supposed to..assasinate Kaidou...when the fight goes awry...so why did you...stab my neck!!"
"Because i told them to, Linlin."
"You!"
"...We can't do anything, Mama. He will eat us otherwise. His Awakening feeds on all elements, even souls."
"So this is...the end...hey Kaidou. Lil Bro...it's been fun..."
Something like that?
LOL, nah
it will be something like:
- After Kaido and Big Mom demolish the supernova in this round
- While Big Mom is lowering her guard completely and maybe that will be around the time he shows her some of her poneglyphs LOL
- Kaido backstabs Big Mom
Big Mom: You bastard, we agreed we would do that after we take over the world!
Kaido: I have no need for you...your road poneglyph copy was in the posession of those kids (Strawhats)
Big Mom: I considered you as my little brother
Kaido: you were the only one with that thought
Blood splattered with him finishing his thrust and cutting her down
Few notes:
1- Oda showed Kaido having the personality of betraying his words too before when he broke his promise with Oden with the 5 years and leaving Wano... And also betrayed Orochi... and LASTLY, he's the big major bad guy of this arc, while Big Mom is secondary, so the logical action is making Kaido betray Big Mom and take her out of equation in logical way... while Big Mom betraying Kaido and weakening him will TAKE AWAY from Luffy/Zoro/and other supernova win over him... the credit will all go away to waste.... Anyway, just like Big Mom betray others, Kaido ALSO betray others, so it's not out of his character
2- Kaido already neglected to tell Big Mom about the secret entrance to Wano/Onigashima... and he STILL didn't do it which is why Smoothie and co still fighting waterfall LMAO.... if they are allies, he would have told her about the entrance
3- Big Mom is the only one calls him "brother" while Kaido never hinted he feels the same about her.... in fact, Big Mom looked OFFENDED for real when Kaido suggested that she is thinking about betraying him this soon, which tells me Kaido is preparing something of that shit against her ALREADY
4- Lastly, everyone in community as I stated seems to be so sure of Big Mom betraying Kaido.... and for me, that's a big sign that Oda MAY FLIP the script around... and make Kaido betray her especially because Kaido has all the above reasons above I mentioned already and because Oda set it up in a way that it can go BOTH WAYS... and Oda will only choose the route that will give MORE IMPACT on viewers....