Let's see...
Maybe back to the First Age? How funny would it be if FPW writes a series of First Age novels starring Tom, who's reminiscent of Ash in
Army of Darkness?
Straight into the Otherness? Like the hole that opened up in the ground in Conspiracies?
Maybe in another moment in time, like slightly ahead of or behind us in time? Something like Stephen King's The Langoliers.
Maybe it transformed him into another lifeform? It would certainly hide one from one's enemies if one were turned into, say, a centipede.
Maybe fpw isn't too sure, and is just hoping we'll all forget about it and he can brush that plot point under the rug?
Speculate away, folks.