Kai sighed, "Oh, great," he muttered, "another princess who I've had a chance at stabbing is going to beat Ryo silly." Sourly he sat back in his seat. He knew he was overstating things; he could have stabbed Satomi, yes. But then she and her guardsmen would have shredded him, discovered his friends and then tortured them all slowly to death. Probably.
As for the twins... he might have been able to kill one of them. But then the other would have killed Hei and then slaughtered the rest of his friends. And then Mio and his family.
Yes, he knew he was overstating things. But the mere thought that he had had a shot at one of the twins and not taken it twisted in his gut.