Aricus, you can still be in the Forum if you like. You'll remain in the current thread until I'm ready to split and merge them. Please let me know what you're doing there, or, if you're going somewhere else, where you intend to go.
Spurius, you witnessed the scene in the Forum at the beginning of the adventure, in the previous thread, and you recognize the other people who are heading up the hill trying to find Adelphus (whose name you know from the earlier conversation that you observed). You already failed your Spot Hidden roll here, so you don't get to roll again, but you do see how Elizabeth, who did see something, and her friends have reacted, and you see where they went. If you want to talk to other PCs, all you have to do is speak in character in your post and say whatever you want to say to them. Then they can respond as they see fit. If you want to ask random people on the hill if they've seen Adelphus, describing him to them, please roll Luck.
You could still go to your outpost to report what you've seen and try to get help. Now that you've seen someone go to the palace, you can find it again. Keep in mind that you'll want to be careful what you tell people about what you noticed about Adelphus. While Romans do believe in magic, it's not something they see every day, and it may take some effort to convince people.