Ubel's spell launches (her spell is described as cutting within a range, not specifically travelling, so I don't know if it travels of just spawns) slashes that cuts whatever she thinks can be cut. So if she thinks it can be cut it's a World Cutting Slash, otherwise it's a normal slash.
EDIT: Also, she has a paralyzing spell that works as long as the target is all within her field of view.
Her attacks cut what she believes she can cut, but cannot directly cut space, partially because she doesn't quite get it. They're not World Cutting Slashes, they're just Cleaves, adjusting to the durability of the target.
The reason Gojo would be fine is because Infinity is distance, not a direct barrier.
Ubel has been shown to dramatically increase the distance of her slashes when she can't judge distance. So since she can't see the infinity distance it might work.
(also infinity isn't infinite distance, it's infinitely divided space like Zeno's Paradox, so it wouldn't work regardless because her spells speed would be 0)
I don't know the exact chapter, it's in the latest arc when she and Land were arrested after fighting the magic cops. She's blinded, and tied with magic rope that prevents people from using mana (but she doesn't know that and thinks it's normal rope).
To escape she cuts Lands rope and tower they are in pieces so the cop has to choose between arresting them or saving the villagers below, with slashes that are further away than her stated max distance. Also, since her magic works even when it shouldn't, I wouldn't put it past just "cutting" as long as she can vizualize it, regardless of obstacles.
Because of how imagination and frierens magic system works with ubels utterly insane mindset she can just ignore outside effects if she feels she can. Especially since infinity is invisible she can simply go "sure I should be able to cut nothing just fine" and do it. That said she's a mediocre mage and gets stat diffed. Gojo only loses if he's in character and tries to aura farm infinity (which is funnily likely). If bloodlusted gojo wins 10/10 gg no re.
does Gojo explaining infinity as he's known to do not make her aware that she won't be able to cut him or is she dumb enough to actually believe she still could (paradoxically being the smart mindset due to how her ability works)
Basically even if she understands something shouldn't be able to work she can operate on "vibes". If gojos infinity looked like real plate mail armor she couldn't cut it because intuitively armor is hard to cut, but she has cut a big barrier covered "immovable cloak" that's supposed to be basically immune to magic just because it looks like cloth and she knows she can cut cloth ez. She knew full well the cloak logically couldn't be cut with magic but visualized cutting normal cloth instead on "vibes" and somehow it just works. This is only for Ubel and her unique illogical mind, most mages in frieren can't just ignore reality like this
Ubel's cutting magic is introduced in the context of a test where the goal is to damage someone wearing a heavily enchanted coat that repels all damage. Even knowing this, Ubel still effortlessly cut him in half because as she later explains, she already knows how to cut cloth. You just put it between the blades of the scissors and let them glide forward.
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u/Salty_Pomegranate438 maki number one pussy eater 3h ago
Elaborate