[With such sad, unsure faces being pointed at him, Sanji nearly insists she not listen to his invasive rambling. The last thing he wants to do is overstep a boundary.
Which is why he's somewhat surprised at her willingness to explain... or attempt, if nothing else. The first part is simple enough, and he nods. Something bad happened. The gesture following after that... alright, something to do with her legs, and he's a pirate, so the first guess is:] Swimming?
[... as for the throat part, that too warrants a guess that's right and wrong at the same time] You lost your voice while swimming? [Sanji's interpretation: a girl who's more at home in the water than on land, and lost her voice in some accident. So now she's dealing with a case of sea legs]
[Action]
Which is why he's somewhat surprised at her willingness to explain... or attempt, if nothing else. The first part is simple enough, and he nods. Something bad happened. The gesture following after that... alright, something to do with her legs, and he's a pirate, so the first guess is:] Swimming?
[... as for the throat part, that too warrants a guess that's right and wrong at the same time] You lost your voice while swimming? [Sanji's interpretation: a girl who's more at home in the water than on land, and lost her voice in some accident. So now she's dealing with a case of sea legs]