Collateral damage on scenery is a cool effect you can easily add to many fights. It can be entirely cosmetic and have no actual effect on the battle, other than to provide colour and make it more exciting. Or you can have bits of the scenery being hit and damaged become important by providing additional hazards or obstacles.
So next time someone swings a sword or fires a gun in a fight and misses, describe what it hits and how it shatters into thousands of pieces, or crashes to the ground, or otherwise breaks. A classic version is destroying a cart laden with fruit, spilling it all over the marketplace. You can easily take inspiration from movie action sequences, looking at how the scenery gets destroyed (such as the tree here), and bring some of that into your games.
Commentary by memnarch (who has not seen the movie)
I think Kylo's the one whose arrogance has doomed them. I'd been so sure Rey was going to need to contribute to help take Kylo down, but Finn is actually doing a ton better than I imagined. I wonder how close this is to the movie in terms of actual action. It feels a bit odd to have someone swinging around a lightsaber without injuring themself, but then again, I've pretend lightsaber fought with brothers and not hit myself.
Kylo Ren: Time to finish this.
Kylo Ren: Disengage and attack. 11.
Finn: Dodge! 14.
GM: Kylo’s sword slashes a tree.
Finn: You use people as pawns! Your selfish greed put Gil and our squad in danger!
Kylo Ren: And your arrogance has doomed you! Now you will experience the full power of the Dark Side!
Finn: You know who I blame for Gil’s death? I blame you!
Kylo Ren: You were soldiers! Expendable grunts!
Finn: I loved him!
Finn: Swing with Extra Effort. 19!
GM: You slice Kylo’s shoulder!
Rey: Did someone order a sliced ham?