Guide for the in-game achievement - Nah, It'll Be Fine (Don't use Shadow Mode)
This final boss can be tough even when using Shadow Mode. You can refer to my exact positioning and action sequence. Teresa and Toya will both need to act twice.
It's best to write out the button sequence and memorize it or look at it while doing this part. You can also pause the game between key presses to minimize reaction time. For example the sequence for this video is as follows:
8F 7F
1F 2F
3D 4D
1G 3S
5D 6click