He might not be able to, but I can.
Every time a gun is used in JoJo by a character who knows what they're doing, it is immediately followed by the character who just used it saying how absolute dogshit they are and that they shouldn't have even bothered. To list a few examples.
Miyamoto using a gun against CD via surprise attack point-blank and going "
ok yeah a gun can't do shit to it" (And his main purpose was to spook Josuke, not to harm anyway).
MiuMiu unloading her gun at Jolyne (who mind you, is way slower than most other Stands) and SF caching them all, with it
established already they're useless on her (
She then proceeds to block a bunch more).
Mista saying a power type would inherently be capable of blocking bullets (
After a Power-Type knocks bullets out of the air by spitting shit at them, and then like, just blitzing them and moving out of the way)
And so on. The only times a gun is used in JoJo are by those who have absolutely no ******* idea what they're up against, or with a bunch of caveats, like the character in question being half dead and to weak to do anything, or as just a means of distraction.
Nobody in JoJo rolls up to a Stand and actually uses a gun with the intent the gun is going to do anything at all against anybody worth a damn, the very first feat a Stand ever did was showing how utterly
useless guns were.
The only exceptions to this are Hol Horse (who's gun ain't exactly normal), Mista (who's able to accelerate his bullets drastically via Sex Pistols, and he still ends up failing to the point it's an actual joke and he needs to use his bullets in unconventional ways to do anything half the time).
Bruh, it's because she was like half-dead.
Pucci even points out if she can even dodge it given her extreme wounds and mobius strip. Aka, he knows she can avoid it normally, but due to the fact she's like, bleeding out all over and is heavily injured, he isn't sure that she can, turns out he was right, Jolyne while turned inside ain't exactly up to par. This ain't an outlier, it's just basic anime "character to weak to do thing they normally can".
Ya'll keep JoJo out of this, we are not the same.