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Originally Posted by Roast Beef

Spoiler!

They set it up throughout the movie. They made a point over and over again of showing how powerful Chewie's bow weapon was. After Kylo killed Han, Chewie shot him with it and he pretty much absorbed the blast without exploding or being thrown back 20 feet through the air like some of the stormtroopers did. Kylo was injured pretty badly even before the fight with Finn and Rey. They made a point of showing the blood on the ground before the fight, and having him beat his chest to pump himself up to get through the pain. My take on it is that he was using a big chunk of his force powers just being able to walk, let alone fight. Rey may not be trained in using a lightsaber, but they did show her being proficient with her staff weapon.

Spoiler!

I think we'll find out that the injury was really bad. It'll end up with Kylo getting some cybernetic parts installed.