There are many kinds of whistleblower analysis of this film. The following is the most reasonable explanation for me.
Poor Claude took the blame in the end, either his wife really withdrew the lawsuit and did not inform, and extended her sentence as an accomplice in the escape; or the warden used the withdrawal of the lawsuit as a bait to deceive her to betray her partner, and eventually she had to serve the full sentence.
After Roland learned the reason why Gio did not escape, he thought of Gio's contribution to the escape and the responsibility of his companions after they escaped, and Ji's mother would be hit even more. Rodland also thought that the plan of betraying his companions could allow the warden to reduce his sentence for himself, which explained the beginning of the film.
The whole film plot is not compact but every detail is so attractive, like a guide to escape. Prison escape expert Rodland is also very courageous to fully confess his hard work. In the face of relapsed humanity, what are the few holes dug for escape from prison?
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