Hermione: He's not relaxing, is he?
Harry: Apparently not.
Hermione: I've gotta do something!
Hermione: Oh, I remember reading something in Herbology... um...
Hermione: Devil's Snare, Devil's Snare..."It's deadly fun, but will sulk in the sun!" That's it! Devil's Snare hates sunlight! Lumos Solem!
Harry: Ron, you okay?
Ron: Lucky we didn't panic.
Harry: Lucky Hermione pays attention in Herbology.
Hermione and Harry relax and sink through the Devil's Snare, Ron is still panicking and squirming.