There was nothing about the girl that had really caught Sebastian's interest when he had first run into her, she seemed as normal as possible for a tenant in this apartment, and he was going to leave it at that. There was only a change when the fourth person -- one he did not recognize -- came by. All of a sudden, the entire aura of the girl changed. He sensed something malevolent, and her very presence was making him uneasy. Damnit. Sebastian felt guilty for even thinking anything remotely negative about someone he didn't know, but his sense of survival was telling him to flee.
These times were really far and few between. He could usually sense the intentions of people he was interacting with, and although there were some who did not seem to have his best interests in mind, there were not many that Sebastian felt were dangerous. His expression plainly said, fuck, what do I do now?, and he had frozen in place. It took an audible sigh and a mental push for him to do anything else.
"Um," Sebastian started, for once not bothering with the potential rudeness of butting into someone else's conversation. His expression changed to a mix of accusation and worry. "Who are you?" No, no, he couldn't do that. For all he knew, the girl could be perfectly nice, this could all be a misunderstanding. She would surely not appreciate his sudden appearance and accusations.
"Nevermind, sorry, I thought you were evil for a second." He mumbled, getting his mail.