It's a soul and body split just using the HDR with a rubbing plate. If one increases the energy within the scalier field by using a Tesla coil, then physically you can time travel.
You have to leave at a certain time when using an HRD, if you accompany it's use by a Tesla Coil.* An HDR user used one to go back to the 1920s by placing a tesla coil on the hood of his Mustang. It took the entire car back to the twenties. However this expands the special relativity to where a division of soul and body is no longer a factor. There is a time limit in which you can visit. Time limit visit I think is one has to return and I think that this is an hour limit.*I think in correction it's a day.
If you mess up, sometimes and I say sometimes a time cop will show up. It could be a human, very rarely a humanoid robot, a Pure Human, which are made in the future, or a lizard man. Be nice to all four, if the show up. Some of these are mute and simply think to them what you might have done wrong.
They have a large pen-like device, or a device wired into their bodies that will take you back to where you belong. Never ever get smart mouthed, or show irritation at a time cop. They could have left you there to begin with and their just exercising their training, which is helping you out of a mess.
Don't steal materials from other timelines or times. Can get you in a whole lot of trouble.