Shock in this context probably refers to the meaning of the word that is surprise, rather than the meaning of the word that is disgust or revulsion. Basically,

Shock in this context probably refers to the meaning of the word that is surprise, rather than the meaning of the word that is disgust or revulsion. Basically, people use the same word to mean subtly different things. Something giving you a shock can mean being startled, but not disgusted. Or it can be the inverse of that. > Something being shocking is not the same as something being unforeseeable. That is true only for one definition/common use of the word.