In the movie Spring Summer Fall Winter and Spring, why does the master cry?

Here is the movie: [Spring Summer Fall Winter and Spring 2003](https://www.youtube.com/watch?v=H1GG6o-hPEA) The plot is that the student having attachment to a woman, leave the temple and marries her. Years fly by, and the student returns because he kills her, after her affair. The master helps him to let the anger out before being caught by the police, and then he immolates himself. After that, he leaves some [śarīra](https://en.wikipedia.org/wiki/%C5%9Aar%C4%ABra) . My question is: why would the master cries before the immolation? (source: [i2.wp.com](https://i2.wp.com/macguff.in/wp-content/uploads/2019/07/Spring-Summer-Fall-Winter-And-Spring-Movie-Still-3.jpg)) My answer is that he disappoints with the student. But isn't that disappointment an attachment?