While trekking the mountain path, Emmerson will receive a transmission from his crew. You’ll learn that they’ll take longer to reach your position and that their long-range radar has detected Kronos ships heading towards the planet. After that brief conversation, continue forth to Santeroule.
As soon as you arrive, exhaust all Private Actions first. Once done, head to the Royal Institute and talk to Casius who is located to the right of the reception desk. He’ll tell you that the expunction device in the institute is not working but you can use the one in the Ancient Institute. Leave the city and head there.
As soon as you exit the city, you’ll get a report that Kronos ships are already orbiting the planet. Surprisingly, there are no enemies so continue forth until a cutscene triggers.
After the event, Emmerson and Anne will stay in Santeroule while the Others will temporarily disband to decide what they need to do next.