Klifon was still shocked by the outcome of the earlier attack. The twins didn't tell him anything. When the assault commenced, they simply touched his ethereal body and told him to stay quiet. Klifon was then moved slowly into a certain position on that chaotic battlefield until everyone's eyes missed his presence for a moment.
It was also at that moment that he felt the light around him going weird. He could still see everything in the surroundings, but he could tell that something wasn't right. His surprise only increased when Rean and Roan began to fly leisurely between the battles while pulling him with them. Some of the experts from both enemies and allies passed closed by, but none of them seemed to be able to notice his presence, nor the twins'.
When they were far away, Rean did his comment about the Werdlem Empire, and only then did Klifon wake up to reality. "Holy shit! How the hell did you do that? How come none of them noticed we moving away this slow?"