Julyan vs Zenos

[Jandor]

It also gets tongue in cheek when you talk to Lyse before the fight. She asks you if any of your friends are on a far east fishing trip.

Why wouldn't they be, at least three of them came over on the same boat (Sirensong sea.)

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In all seriousness though, most of the time the game doesn't mention friends either way, some of the time it mentions bringing people along, and once it outright says you face a primal solo.
You'd think if soloing everything was canon rather than personal interpretation the game would outright say it a tad more often than it does.

I tend to think that you winning the fight is canon (obviously,) but the specifics of how you won the fight are not.