Unfortunately, the reason why Ned can use the slingshot in “Spider-Man: No Way Home” is never revealed to the public. It seems like this is something writers and producers are keeping open, as there was a brief comment from Doctor Strange that suggests Ned is more than he looks. The prospective MIT student also mentions that he sometimes has tingling fingers in his fingers and that his grandmother said he might have magic in him.
Based on Ned’s comic book story, we might get a glimpse of where all of this is going and how it relates to magic. In the Hobgoblin storyline of “Symbiote Spider-Man: Alien Reality” # 2-3 (which was long hinted at for “No Way Home” but didn’t happen), Ned is brainwashed and becomes the apprentice. of Baron Mordo. Ned steals the Book of God, which helps him and his mentor reshape reality, making Mordo the Supreme Wizard. Ned certainly touches the magic here, but he never had it in him.
Will Ned get villainous in the MCU? May be. But probably not. Doctor Strange seems somewhat interested in what he has to offer, and we might see an apprenticeship forming between this duo instead of Mordo and Ned. There are too many questions and things have been left too open for us not to get answers on Ned’s magical ability in a future MCU project.