darkness

You work the night shift,
From 11:00 PM when the store is closed,
Until 6:00 AM when the store opens.
You aren't working alone;
Two other security guards work with you.
Your task is
To check the equipment.
The three of you work together;
The store is large,
With two floors.
On the first floor,
They sell groceries, and on the second floor, they sell electronics.

You arrive at the store
And greet Misha—he's 20 and hasn't been here long—
And Kolyan—he's already 50.
He's been working here for 10 years, and everyone knows him.
They greet you back.
The three of you head toward the security office.
As you pass by, you notice something near the registers,
But you don't pay it any attention.
The three of you drink some tea and go about your business.
You go to fix a register
Because you were told it was broken,
And you notice two figures:
One tall figure by the registers, and another figure standing beside it.

(Your actions?)
(What will you do? They are looking at you, and you are looking at them.)
(The time is currently 2:00 AM.)