i'm imagining the scene has an experimentee at the cafe, interacting with people who can see them for the first time.

people say nice things to the vivisectee that they have never before heard, and these things are expressed clearly for readers.

idea of rejected-superpower-request, where vivisectee dialogue might be translated to emotional gibberish:

"woah! you can make stuff float! make me float!"

 "omigod! no! that's the kind of stuff the researchers would force us to do for months and months! I don't want to make anything float ever again! do you have any idea how hard it is to make something float? imagine you are having your muscles and organs pulled out by machines, and they pull just a little harder whenever you stop trying to make things float, and stop pulling when you find a way to mess with the surrounding lab equipment to somehow slightly push something just a little tiny bit, and then start ripping you apart again if you don't try to make it move even farther! ok? look. here's your head. here's your tongue. imagine there is a robot claw piercing your tongue, slowly pulling it out of your head ..."

"ok ok omigod I get the picture"