Hey there,

I think it doesn't imprint on time itself. For my understanding it imprints in the akashic realm which creates a thoughtform with its own personality. It can act by itself and does so. It was only created to repeat that event until someone can free it. I think thats why if we watch the akashic chronics we can see such events long ahead, but not always clear.
But the thoughtform only starts acting after the occurring of the event in the now.

I take this idea from the first book of franz bardon where he talks abouth the akashic realm and thoughtforms in the beginning of the book.

All the best