Based on the context and the answer, generate a question. 

Context: Hakkai stepped back in mild shock at the sudden outburst and observed a similar surprise wash over Sanzo 's face leaving a stricken expression at having admitted such a thing . " Oh ? " The healer asked quietly . " Am I correct in guessing that these are not the usual nightmares you suffer ? "

Answer:

Sanzo 's statement is unique for him .



Why is the crowd disturbed by Sanzo 's statement ?