So is the witness (spoiler)?

Maybe it wasn't the Witness who was touching him, but Cassie - in the physical sense.

I thought of that too but the witness wasnt physically there. I dont think consciousness alone would trigger a paradox.

Perhaps that is why he is outside of all realms? Because he survived his own paradox?

This only holds true in a linear timeline. The witness exists in a realm where time is not linear; the past, present and future exist simultaneously. Paradox's cannot happen if time is absent.

I don't know where they got that *beep* from. Perhaps Timecop ("the same object cannot inhabit the same place at the same time"). That's pure crap. I'm no physicist, but I cannot imagine a reason why (assuming time travel is possible), bringing an object into contact (or close proximity) to itself would cause any sort of problem. Moreover, "the same object", at least at a quantum level, is NOT the same object at all. Consider the human body, since that's what we're talking about here. Every atom in every cell in a human body is constantly being replaced by other atoms of the same element. Pick any atom in any cell in your body, and I guarantee you it won't be in your body a week from now. Since time works at the quantum level, an "object" would have to be identical at the quantum level for time to recognize it as being "identical", and it just ISN'T. Moreover, even if atoms in your body weren't rotated in and out continuously, there still would be no paradox. The only "objects" that time would recognize as being "the same" or "in contact" with each other (since, again, time works at the quantum level) are subatomic particles. If the kid came in contact with his older self, then that does not mean that any of the atoms or subatomic particles in one body contacted the identical particles in the other body. Even if the two could overcome the physical resistant, such that one body was inside the other, and even if all the atoms and subatomic particles in the body were the same and in the same location, they could not possibly line up together so perfectly that any single atom would contact its twin.