"It might seem pure altruism to you and maybe it is in Sabrina's case. She really is nice, but I look at it this way. We're all stuck here. We all need each other to deal with whatever this hotel throws at us. I'm convinced that there's magic involved, but people have had to deal with some pretty strange things. Helping him costs me nothing and maybe one day I'll need his help." Regulus shrugged. "If you look at it this way, cost v. benefits, the benefits far outweigh the costs."
He thought about it for a moment. "I think altruism is really subjective, isn't it? We all have different ideas of what's a reasonable cost. Also, Erwin sounds like a good person. I probably wouldn't do the same for other people here even though it would still cost me nothing and there would be benefits."