(How would Carissa know that, if it was true? But if it's info Carissa shouldn't have, from his perspective, on the gaslighting hypotheses he's always considering in the back of his mind, she wouldn't just blurt it out, would she? If they were that bad at pranks they'd have screwed up by now surely.)
"Make it so," Keltham says. "And then continue the massage, if you've... rephrase, continue the massage and tell me if you're running out of easy energy for it."