What is unusual about the attendants on Glubbdubdrib?

"He desired me to give him some account of my travels; and, to let me see that I should be treated without ceremony, he dismissed all his attendants with a turn of his finger; at which, to my great astonishment, they vanished in an instant, like visions in a dream ....."

Xdffgvghn. Jjjkm.