Forgive me if this has been posted before (I looked around and didn't see it). In the final level there is another Nikoladze at the very end of the game. After you clear out the final four guards infront of the door backtrack to the elevator in the library. Take out anyone you might have missed before. You'll hear footsteps from the room above. If you hit the switch it will tell you that the elevator has no power. Go down into the cellar, use the computer and put a bullet in it. Now the elevator will work. There is an elite guard walking into the wall. He won't respond if you put a couple of rounds into his chest but he can be killed. Go to the end of the hallway and into the room with the open windows and bodies. Nikoladze will be standing there. He won't respond to you either but can be killed all the same.
I stumbled across this the other day and didn't know if anyone else had discovered it either.
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