"Then who?" Iron Man demanded, the spike of anger evident even through his modulators and that protective layer of metal that was supposed to contain it. The only other Avenger that could get out there as fast and knew the layout as well was the Scarlet Witch, and she was the last person that should be setting foot on that island. If the fastest man alive could end up in Magneto's prison, they might as well gift wrap his sister before sending her in. With a deep breath, Tony continued as though the smirk had always been in his voice, threatening, "I could just drug you, knock you right out, you wouldn't even know I was gone." There might have been a grain of truth there, but Iron Man was looking away again, focus on the next entry wound and assessing the depth of the foreign body. If Steve really thought the only thing he had to stop Tony was invoking some sort of permission system, then he didn't have any better ideas. Not to mention what state of delirium he had to be in to think he could start 'letting' Tony do anything.