I thought it was a memory, D's self-blame, guilt trip,
but it turned out to be a hallucination, a future fantasy before D was hit and fell to the ground.
If you think about it carefully, it works. The habitual thinking is that M will sacrifice himself for friendship, and then D will survive and live in the shadows. But the actual film theme is closely related to D's life, the present and the future, all the details have revealed the final ending.
I've always liked unexpected endings, but this exception is so unspeakable.
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