Oh … reeeeeelly?
To not digress: a bullet or a dagger (etc etc etc ad infinitem) kills because of disruption. (It seems a Law Of Nature that no two physical objects can occupy the same space at the same time.)
ALONG COMES MERLIN
who bashes you delicately on the head with his magic wand, and with a few well chosen words sends you back through time.
You, yes, YOU go back just one second (a kind of practise run, testing the waters as it were) and there you now are, two of you—
If ‘no’ … why no?