Saitou reads it silently, and he does consider being hesitant and consider all options but at the same time they've come this far that he isn't sure there's going to be much he won't give if it means saving Souji. He lets a small sigh escape him before proceeding to kneel as instructed. He doesn't speak out loud initially, taking it first to think it although if nothing happens by thinking it he will eventually turn those thoughts into actual vocal words.

Someone very important to me is dying before his time through no far of his own. I want to save him.

Saitou doesn't wait for Chizuru because he doesn't feel she has to make any requests or actions after what happened to her although he certainly will not stop her if she decides to kneel beside him, after all, either.