The assassin

You open the door but lean against the wall straight away. The soldiers start firing at the door immediately until they notice that no one is there. You stay against the wall, wait for a guard then you Punch him in the face and slam him into the wall. You knock him out. The remaining 19 Guards come runnign out. you quickly jump in a container beside the building and hide in it. The 19 Guards run out but can't see you anywhere. Then one of the men get a knife in their head. You look in astonishment.

"WTF," you whisper.

Then a guy jumps down and takes on all the 18 remaining Guards. You get out and help him. In 10 seconds they are all dead.

"Who the hell are you?" You ask the other Assassin.

"I keep my name secret, as is the life I lead."

He walks away. You...