Hi, you have hit on an aspect that seems to need clarification, and you are right to question it. This is a point that should certainly be made clearer in the next v1.1 release. Your interpretation is spot on and is exactly how it should be played.
When rolling 3d6 for a connection in Hard mode, you are more likely to get the Epic Conclusion result. A roll of 12 or more should be a turning point. The intent is that these rolls represent a big shocking result that fundamentally alters the direction of the campaign or leads to an epic ending.
For example, a roll of 15 might mean that you've not only connected with a new scene, but that you've uncovered the hidden strength of the main villain. A roll of 18 might mean that your character stumbles upon a world-changing secret or a legendary secret. A roll of 20 or higher could be an Epic Ending. These high rolls should lead to a moment in the story that feels like the culmination of an entire act, (or the final act), prompting you to adjust your narrative on the fly.
Thanks for your message. Comments like yours are a real help. This issue will be clarified in the next version.