I understand perfectly what you are talking about, but let me also say this. If you are killed back in time while you exist, your spirit can go and possess your own younger body, if you know where you where/are........this could be the eternal life everyone is looking for.....through time space and possibly bringing yourself forward to a new timeline skew. Who will keep track of the skews so they don't get all skewed up...
Time travel is real...the US learned about time travel through the downed alien spacecraft in Rosewell NM and through the Philadelphia Experiment...it is real...I have been there, as in studied all about it....they actually learned to bend the time line and create skews of trips. One skew does not affect the other both exist the original with ripples to cover paradox....
The space craft need a way to get back into there time as in the light speed effect and travel through time....