There's no panel there, but the full conversation is this.
"Bonney, ever since I was a boy, I wanted to be a hero who could save the imprisoned and suffering. Just like the warrior of liberation!"
"Nika?"
"That's right. He's my idol. He appears from the blue with laughter and this rythm. Doom-dut-da-da Doom-dut-da-da."
"Will he come to free me too?"
"Of course"
I guess the sea thing specifically, is directed at Kuma depending on the translation, but the general idea is that Kuma is telling Bonney the same thing his father told him.