Really been thinking about this frame a lot once I noticed that his eye does that. WHY DOES IT DO THAT? WHAT DOES THIS MEAN??
Also same eye as aero Rover teehee (not terminally insane about them)
The only other instance I can find of this is from the livestream trailer with this shot, of which I'm assuming may be from the next story unless this happened in the current one (but I think I'd remember a glitchy scary-eyed Luuk)
His eyes have a slight glow to them during his burst animation, but not with this x. Is it when he's locked onto a target? If that was so, then why doesn't it show when he's throwing the knife in the trailer?
I'm sure we'll fine out either through the story or his character information, but I want to theorise and figure it out now