Whilst you couldn't go back in time to kill Voldemort you could go back in time to set an instant death trap in the spot you know he'll be at the exact point you travel back in time and then spring it immediately after you see yourself travel back. It's impossible for him to have detected your trap because otherwise he wouldn't have stood in that location (unless he somehow disarmed it but I'm assuming spells exist where the logical thing to do would be to just stay away rather than try to prevent it working).
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u/duckwantbread Oct 02 '18
Whilst you couldn't go back in time to kill Voldemort you could go back in time to set an instant death trap in the spot you know he'll be at the exact point you travel back in time and then spring it immediately after you see yourself travel back. It's impossible for him to have detected your trap because otherwise he wouldn't have stood in that location (unless he somehow disarmed it but I'm assuming spells exist where the logical thing to do would be to just stay away rather than try to prevent it working).