Encounter
D’Arrerion approached the door and was looking for his key to make sure that he had actually forgotten it and that it wasn’t somewhere in his pocket. After confirming that it wasn’t there, he was about to turn to the intercom and buzz his neighbor to ask him to open the door, but then Cindy arrived.
She was coming down the main entrance and saw D’Arrerion, someone she had never seen before, acting strangely in front of the door. This immediately triggered a reaction for her to become suspicious of his intentions. She decided that she was going to open up the door and confront him about what he was doing.