The way I picture it they can feel each other's distress... unless one intentionally blocks out the other... which will come in to play later... and they can share senses (to the point of high-jacking as CJ demonstrated)... in my first 'draft' Rachel and CJ became secondary characters more than I liked, so as I'm chopping that up into ~2.5k word posts I'm adding more of them to it so they don't fade away like they have where I am at the moment. Currently I need to start adapting Ides of Metropolis...
Some of the neatest moments I've had are where I have CJ say something to Clark telepathically and the reaction fits with what is in the episode... also watch Lois closely =P
