[She's about to comment that on what kinds of things Robbie could do if he was waterproof — not that she thinks Precis would want him tromping around in sewer gunk either way — until she warns her about something in the water. Instead of immediately getting out she starts to freak out a little bit, turning this way and that while looking down into the water.]
omg
Wait, what?! Wh-what kind of thing?! Where?!