Question for any physicist out there....SPOILER...
If this has been asked and answered then I apologize in advance. What exactly did Alexander(Guy Pearce)do at the end that created the huge (strange) explosion or what ever that was? He said that he was "changing the future". Then he started his time machine and jammed his pocket watch in the mechanism causing this whole thing to eventually erupt into significant chaos. But what exactly did he do? Or was it supposed to be vague because it didn't make a lot of sense?
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