I volunteered at a range and assisted with the training courses. The training itself shakes the leaves from the tree. Many that thought they had what it took were given a wakeup call and they wouldn't even finish the classes or they'd never return if they did. If the trainers make the class as closed to the experience as they can, it will deter those just in it for the cash.
Setup is the meaning you mean, so set up probably just means they were outside waiting for the shooting to take place.
As for what happened on 24th, or 23rd since it was soon after Midnight, we're unsure.
Here's another way to look at Lunev.. he was a defector and in Witness Protection. Kissinger was also called the Bridge, so perhaps Kissinger is now in protective custody because of something that happened.
Because they created the clowns… it all starts there.