River of blood

Five minutes before the agreed time, two vans and a small car stop by the seemingly abandoned building which has no lights. 70 meters across the cars is another building which also seems to be abandoned. In between these two buildings is a lake, connected by a foot bridge. The only light in this place is in the middle of the foot bridge, so it is difficult to see people clearly standing on either side of the building. You’d have to come closer to the light in the bridge to see.