turtlephilly

Hey guys, I need to help, maybe I'm stupid. So i don't like the default dead eye where i just mouse over enemies and the computer auto marks where i have moused over. I want to be able to tap r1 or just shoot myself in this slow motion state. How do I do this? I'm currently very close to the start of the game the train bit without spoiling too much. Please help. (Also in the help section of the game it says i should be able to tap r1 to mark enemies but it just auto targets where i mouse over)