Jayden had been forcibly holding his mouth closed while Ceridwen was apparently traipsing around the attic. JJ and Nicholas stood watch, making sure Jayden didn't just run away. A truth spell?! That was terrifying.
And then Ceridwen returned, followed by some kind of terrifying thing and Jayden forgot all about trying to stay silent. "AUGH! IT'S AN IMP!" he screamed, darting behind Nicholas so he could hide.