Anna might notice that said guy is standing unnaturally still, one arm suspended half-up as if he's expecting birds to start nesting on it. Though all things considered, he's lucky his body didn't take the figure-of-speech 'freeze' any more literally than it did.

His eyes are fixed with a horrified fascination on Eden's open mouth, as he waits -- thanks to her he's incapable of doing anything else, helpless -- for her next command.