The flashback continues, driving home the point that humans are wretched beings who enslaved fishmen, but that fishmen themselves aren’t so goody good either. Most of the example of fishmen being just as “evil” as humans is piled onto Arlong, who can’t have a single panel where he acts like he even has a heart. On the other hand, Fisher Tiger represents the leader of justice, firmly stating that they will not kill anyone, revealing that he pretty much shares the same sentiments as Otohime, and is in essence, a “good” character. The fact is, he realizes action must be taken against humans to rid corruption, whereas Otohime’s method is “communication and peace will win.” Again, it’s not exactly the most captivating of developments, and if you can see the stances every character takes, it becomes a bit predictable.
This is also because most of the time, the flashback has been glazing over and rushing through the “cause and effects” of fishman discrimination. When it started focusing on Koala, the little human boy, emotions suddenly ran high and felt a lot more immersive. Having the fishmen see a human slave right before their own eyes, young and completely conditioned, is probably the best showing of who’s the real enemy here. It’s not the fishmen, it’s not the humans, it’s the World Government. This trip to take the kid home might be the one where Fisher Tiger meets his fate.