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I said that you take your own place when you see yourself disappear into the past.
This is a very easy topic to hurt your head with. 
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If that's it, then I'm supposing someone else has thrown the rock. But that means there is still an alternet choice of someone using a different rock to save you with. Or you just die. Or you choose to call the police the second the robber comes in the house.
But then there is a time paradox. Since you've disturbed the balance of you going back into past, confusion shall pur.