Kicked to the curb.
It seems that even the greenest imperial conscript has seen enough crazy in his (probably short) life that he will not freak out and lose his chalk even in the face of Anakharis, High Spider Lord of the El'Lahuan Tombworld.
Flayed ones, on the other hand, will freak him the freak out...they's freaky.
Yeah, it's like Iorek said (am I pronouncing that correctly?), there are psychic powers, special abilities and wargear that emulate those effects instead of them being blanket special rules.