Man, who has strength proportionate to a spider, hits Ock  plenty of times, not only with his fists, webs, and feet, but with a  desk and a window, too. All of these times Ock barely flinches with  the blows. And yet, at the end of this scene, the elderly Aunt May  clubs Ock over the head with an umbrella hard enough not only to  make him back off but to break his sun glasses which were previously  unscratched. It has been well known that Peter pulls his punches to  refrain from dealing damage to his enemies which my not be able to  take the full blow of one of his hits.