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Of course there could be some sort of conversion of matter block on time travel. Matter from one time is coverted to energy and moved back in time, it displaces an equal mount of energy from the target time period to the future. The question is if the time traveler can be placing into the displaced energy as matter, or if they can only be placed there as energy. Possibly in a non-corporal form and thus not be able to effect any changes in the timeline because they cannot interact with it at all. Only observe from any angle they choose. However if they are there as energy, then might be able to interact or be converted to another form of energy by local means...but that would probably kill the time traveller...but could cause an interaction in time (overloading a powerplant or sparking an spontanious human combustion maybe (a second human sized energy source inside an existing body...doubles the temperature...boom?)
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