Question: After Donnie has gone back to the start of the loop, he lets himself be hit by the jet engine, presumably to save Gretchen, Frank and everyone else whose life he screwed up in the alternate future. What I don't understand is, since he knows what's going to happen and can see the path (literally) in front of him, why doesn't he try to change it? If he knew what was coming he could save Gretchen without dying himself.
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Chosen answer: There are a couple reasons. One, the whole timeloop where Gretchen dies is the result of him surviving the jet engine incident. If he were to survive it, everything will happen again including Gretchen's death. He gave himself up for her. The other reason could be, that he is happy and not sure if it is a dream, so he just lets it happen (this is said in the commentary).
XIII