There's three stages to this fight. For the most part, after you get your first point of focus, the fight is going to mostly be about getting health back and cooling off combos. You will not need any power pressens, so set up your combos into a solid format.
Stage 1: A memory box will appear, but the player will be shocked when they attack it. The player needs to use the Fury s-Pressen and focus on hitting the box. After this a second box will appear and it too needs to be destroyed.
After that point, a open box will appear and say "spam" The player needs to spam that target (I find using the spammer normally instead of the junk bolt is better). At this point the enemy will just shoot blasts at the floor, just keep dodging and shooting when you can.
Finally the game will have Nilin jump up to the final area, and automatically start a fury, hit the target until it dies.
Stage 2: Instead of using Sensen Fury, use Sensen Rust In Peace. Do it twice, and you'll again be asked to spam the box., and then beat down the final target.
Stage 3. In this stage you need to use gain 2 focus potentially, and use a Sensen DOS and then a Fury after it (you may be able to use a DOS, build up a second focus and then fury after it, but it's easier to get both focus points at one time, and by this point you probably already have enough for 2). Do this twice, and you'll have to spam the open box again, and then beat down the third and final target.
There is no QTE to finish the fight.
Note: The Video has a lot of spoilers, it shows the final section of the game and the final fight as well as the ending. It's owned by Constipated Owl.