screamingmetal
Super Freak
As for the final Rey-Kylo battle, they made it a HUGE point to show how much damage Chewie's bow-caster could do throughout the movie. And they even had Kylo pounding his wound from the shot (as if he was getting himself pumped up to fight) to remind everyone that, hey, he just got shot by an super powerful weapon. The movie literally could not have been more clear or done a better job setting up the fact that he was fighting with a significant injury at the end.
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Personally I didn't see that as him pumping himself up for a fight but anger and frustration that his injury was slowing him down and preventing him from taking on Rey fully.
I agree that he was injured and not fighting at his full strength, but even then I think he would've been stronger than Rey both with skill, experience, and physical strength to defeat Rey with a lightsaber.
For instance, someone like Bruce Lee may be injured somewhat and can't use his dominant hand, but I still think he can kick my *** in a nunchuck battle.