Partner. [The correction is automatic. Nothing else bears it.]

We were each on opposite sides of a wall, if you will. We discovered, at almost precisely the same moment, the first... crack. A single atom that refused to fall. We used it as a transmitter for Morse code, opening and closing the field we discovered.

By each working on our side, we were eventually able to engineer a device that allowed for the transfer of one person from one world to a different one.

I crossed the threshold to join my partner, to allow us to work together in one world rather than separately in two.