When Zoro and whoever else make it to the dome, there'll be a few Scabbards still conscious- by process of elimination, one of them will have to be Kin'emon. Zoro will demand Kin'emon teach him how to cut fire, alluding to Punk Hazard when Kin did the same thing against Vegapunk's artificial dragon and Zoro mused to himself that he'd like to learn that. Now we've seen that Kin's technique can cut Kaidou's fire, Zoro will want to use that TO CUT KAIDOU'S FLAME CLOUD THAT'S CARRYING ONIGASHIMA.
In typical One Piece fashion, Kin'emon will explain that he just has to think about cutting fire *really* hard to do it. Zoro is immediately infuriated for like two panels before having a flashback to his fight with Mr. 1 and learning to cut steel, maybe another flashback to his sensei talking about 'cutting nothing'.
Cue Zoro slicing through Onigashima and cutting nothing but Kaidou's "flame cloud", dropping the island before it crushes Ebisu Town.
In typical One Piece fashion, Kin'emon will explain that he just has to think about cutting fire *really* hard to do it. Zoro is immediately infuriated for like two panels before having a flashback to his fight with Mr. 1 and learning to cut steel, maybe another flashback to his sensei talking about 'cutting nothing'.
Cue Zoro slicing through Onigashima and cutting nothing but Kaidou's "flame cloud", dropping the island before it crushes Ebisu Town.