Since Epic Rage is called before the hero's formation fights, while Heroic Duel is called at the start of the phase, the situation you describe can't actually happen.
There is still a bit of an issue however. The ruling that Epic Strike can be used in a duel establishes the precedent that a duel qualifies as a fight for calling epic actions, however, the wording of ES is that it is called before the hero fights, while Epic Rage (and all the other epic actions called at the same time) are phrased that they are called before the hero's FORMATION fights, so there has been some debate as to whether those actions can be called before a duel. Discuss with your group to decide how you want to handle it.
If "before the hero's formation fights" actions can not be called before a duel then at the start of the phase your opponent calls a duel and that has to be fully resolved before moving on to the fight, when ER can be called.
If your group decides that "before the hero's formation fights" and "before the hero fights" are intended to be the same, then your opponent calls a duel at the start of the phase, when the duel is ready to resolve it creates a new "before a fight" trigger during which Epic Rage, Epic Strike, and similar actions can be called. In that case, all of those actions would need to be resolved before proceeding with the duel, including the ER.
I can see arguments for both sides. I tend to lean toward the RAW interpretation that there is a difference between "before the hero's formation fights" and "before the hero fights", but the authors were pretty sloppy when it comes to that kind of wording, in several places they seem to forget that the game is organized around companies not individual models, so I can see someone arguing that the two are meant to be identical.
Of course, adding Heroic Fight to the mix creates a whole new set of complexities and rules issues, but I'll save that discussion for a latter time.
Hope that made sense. For some reason most people seem to have trouble understanding timing issues of the game but if you read the rules for epic actions carefully, they really make perfect sense and there are hardly any unclear areas.
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