The door is not locked and so it casually swings inwards.
It opens onto what looks to be a cavernous room. The cube-like structure, Duinhir can be sure now, is a warehouse.
Being on the roof of a second story building, you can also figure that you are looking upon some sort of raised platform area, within the warehouse.
The warehouse is lit brightly from within, but all the light sources must be down on the main floor, because all of this upper platform area which your door opened onto is bathed in shadow.
And lastly there are two figures of men up on the platform with you, silhouetted by the light - one standing just a few feet from the door, and the other, maybe 50' away.
The closest one must hear the door opening as he turns, and squints at Duinhir who himself is shrouded by the dark, and the man says something in Southron, and moves to approach the door, his hand resting on the pommel of a wooden baton...