He just looked reallll sad and vulnerable.
"Hm-"
He looked up and saw them
"EEP!!"
Ok so here's how shit goes downn-basicalllyyyy-they lure him in with kindness-so more or less Ursula's like "yeah dude I can make you human and then you can be with your prince whooooooooooooooooooo-but like obviously there's some lil um-caveats there-) but basically the eel friends are like real sympathetic and like "yeah, Ursula can help, she's so coollll we'll take you to herrrrr-" yeah you get the idea-