The Secrets of Time Travel

I can observe any point in the past, but can't directly interact with any person or object there. For me, it's like stepping into another room. The future is unreachable to me and everyone else in the guild. No one knows why, but I'm not complaining. People would never leave me alone if I could tell them their futures. In this case, I don't need to go back far. A few hours will do.