timeline question

[Goldengirl]

I think shifting timelines must be done one person at a time, mainly because everyone's timelines are their own. There may be similarities and overlaps, but still, each person has their own timelines they can choose to follow.
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And if you subscribe to the multiverse theory, each choice can represent a new spin-off. I just can't wrap my mind around how you can have multiple universes, yet still jump timelines. It suggests a point of consciousness that is making the jump, that is singular in nature?!

Does anyone have a way of explaining this?