The male understands english but these females haven't heard it enough. She does understand the hat being taken away from her and Jack trying to offer another bottle when she already has plenty. There's no interest in this. she glares at him for not letting her have the hat instead.
He's obviously trying to share with her this filthy water stuff. She takes it, smelling what's inside. It's awful. Smells terrible. She dumps some of it out and dislikes it even more. The bottle is tossed back into his boat, pouring out and she points to his hat making loud barking noises. The other follow suit, pointing and barking. Not wanting anything to do with the rum, they all avoid the spot it was dumped, not wanting to absorb it.
When Jack refuses to give up his hat even with their insistence, the blonde dives. The other two keep him in their sight, speaking to each other in high whining noises. Soon the blonde comes back up, offering Jack a large conch shell. She sways her head side to side making pleading noises. A pleasant thing between bubbling and squeaking.