How is Ky different from everyone else during a film's death scene?

Xander senses that something is wrong and tries to comfort Cassia. She doesn't feel as if she can share her thoughts about Ky with him so she says it's just her grandfather, which is partially true. During the film, the youth see an over-done scenario of death outside the Society. Cassia notes that Ky is crying. She isn't accustomed to seeing someone suffer. She pretends she doesn't notice.