...... Is this why we can't have nice things? Because people can't share?

I'm not sure if I should be more surprised by the lightsaber being pulled in half or the explosion that happened just after. I mean, we've seen lightsabers get chopped in half before without an explosion, so there's gotta be something else going on. Are we seeing the first instance of Force Explosion? It wouldn't be the most out there of Force powers shown off in the sequels, so it seems plausible. And since Kylo and Rey were moving apart, there'd be a lot of pulling force here to pull the laser sword in half.

Hey, maybe this ends up being part of the next movie's plot! Rey takes her half and runs away with it, and Kylo is dumb enough to think that he needs this particular lightsaber. For some reason. So as a result, he makes the First Order chase Rey down to try and recover it. That could be a good central conflict of some kind. The only sticking point is Rey deciding to run away at this moment and successfully doing so as well.