Something was really catching his interest in this group, for some reason. The energy he felt from them, perhaps... Or was it the fact they come to this building everyday that had him interested? He wasn't able to put his finger onto it for the moment. Seeing he was starting to catch attention, he decided to take his leave. If he felt like it, he could easily find them later on, provided he didn't stray too far from them. The shadows were a great way to get around many things in the human world. The only fact he should point out is that it's easy, as long as you don't get caught.