So far I don't see the purpose of it. Sure, it'd be parallel to Guts but a visual one only. Guts had a horrible last vision with his right eye and isn't only always reminded of that scene but is also massively handicapped due to the injury (at least in theory, he's still probably one of the strongest human fighters even without the Berserk's (thanks for the info up top) armour). I think it also intensifies the image of him being a struggler, keeping on fighting despite the circumstances. She died a short time later anyway, maybe even due to that injury if it went further inside than Guts', but doesn't enhance the parallel much further. For it to be later on revealed there'd have to be a reason.I've been wondering whether she might have lost her right eye...
There's definitely more blood under her right eye compared to her left side of the face and her neck, her right shoulder and to her left breast, too, though so I'm not saying this isn't a possibility.
I could definitely see a turn of events that first show how bad ("foolish") of a person Gaiseric was and Void being shown as the victim, he got tortured in the end after all. I would, however, see Miura showing us some bad sides of Void before the sacrifice, just as we saw with Griffith. Griffith's likeable scenes are those when we see him in these moments together with Guts, his only friend, but there were plenty of other scenes that showed us the monster Griffith could be, too. Scenes of Gaiseric with the woman could show his most decent, human sides.I don't think it's too farfetched to say that Void could have been a decent human being or at least more decent than Gaiseric back then.
Nonetheless, Void is probably the biggest bad guy in the series, so the overall image of him we'll get won't be too decent I reckon. But it could serve as a first impression we'll get of him. I expect at least 2 more episodes of flashback content in which the first could give us that false image with some hints of his real personality and the second showing us how it came to the end after all.
Jan's fanfiction, the end.