Escort Hannibal
If the player reports back to Hannibal that there are no mutants, he will gather up his group and head for the memorial. He tells you to wait an hour and they will be ready (press 'T', the 'select' button or the 'BACK' button during normal game play to activate the WAIT dialog). To ensure Hannibal has started the trip, you really should WAIT an hour after speaking with him at the
Temple of the Union; after which, you may then fast travel to the nearby
Mall Northwest Metro Station, where Hannibal will eventually arrive. If you fast travel to the memorial without Waiting an hour, the group will not arrive until you fast travel back and trigger their departure. However, even this may not work correctly. After telling Hannibal that Caleb is ready, you may have to fast travel to the Mall Northwest Metro station and wait a full 24 hours for the former slaves to appear.