You think the team is going to just charge forward while they are being stripped of their equipment at best and being attacked by flying objects at worst? Magento can literally set off all the grenades Rocket and Quill have without even removing them from where they are stored like he did it X-2. He could also just hold them in place like he did to the X-Men in the first film in the Statue of Liberty with all that metal. I can't see any of them reaching him before being immobilized and turned into scraps