Because someone came to get the research results of Peter's father, that is, the document that Peter gave to Dr. Lizard in the movie, which is the research results of cross-species transgenic research. That person is most likely the person who killed Peter's parents and also appeared in the movie eggs. Finally, the mysterious man who died with lightning has been officially said, and that is the enemy of Spider-Man in the next movie: the electro-optic man!