Take what you want then leave undetected. If seen by anyone, kill them on the spot.

Simple rules

It was all going smoothly until those bright eyes seemed to shine it's pure light onto him from the corner of the room. It made him stop. Stare. By reflex he took out the gun from the holster and raised it, pointing straight for his head. He could see it, the fear in his eyes, the slight trembling of his body that left him immobile as he sank down to the floor. Stern, cold and merciless eyes looked back at the boy. He would've been dead by now. Would have. Why hasn't he pulled the trigger just yet? Why was it so hard to pull the trigger?

"Please don't hurt me..." a whimper, his voice shook as he spoke and he looked like he was about to cry. The killer looked down at him, and just like that he put the gun back into its holster and roughly pulled the whimpering kid.

"Make noise and I'll shoot you. You're coming with me."