When he'd gotten high enough, Trowa momentarily abandoned his chair to go and help pull the old man inside-- and to get a good look at Fishy Lady Une with his own two eyes.
Definitely reproductive function. Ovipositor, if he guessed properly, which he associated with insects and not sea life. Then again, this was an island that he couldn't identify. Who knew what went on?
With that in mind, he dragged the man in and closed the cockpit, returning to his chair and flipping on the comm once more.
"How exactly do you plan to kill us ten times over?"