The Knights of Chaos are covered from head to toe in the gray cloth, while the rest of the officers in Chaos are only wearing breastplates. It's probable that their faces are not protected, but Sunshine lacks the visual clues that Dragon Army has to make that leap.

Besides, they're wee ickle firsties. Their magical reserves are tiny, it could be that many of them aren't attacking in hopes that someone will figure out the trick and then they wouldn't be useless because they blew all of their magic. Or they're currently scared sheep terrified of the invincible Knights of Chaos. Who knows?