Eridan blinks after the girl, because nobody usually cares enough to point out what about his behavior is wrong, at least not so clearly. Who am I kidding, people point it out all the time, he usually just isn't trapped on an abandoned island with them at the time.

Eridan opens his mouth to argue that, or maybe agree, but stops short. He points at Jade's skirt where one of the starfishes from the tide pool is unceremoniously stuck.