The campus was virtually silent, all of the streets cleared of the usual movement and advancement, even the light-rail immobile for the occasion. It could have been a model city of the future kept under glass. The stillness lent it an unfamiliar quality; suddenly, the new green of the rigidly lined trees stood out boldly against the white walls, and the birds didn't squabble and panic as their roosts were disturbed but sung in a watery spring sun, unaware of the danger it took to allow them to reclaim their clean environment. Best case scenario: Pietro was brought in, the surgery went uninterrupted, Magneto was dispatched quickly and quietly before he could take his kidnapped son back to whatever prison they had made for him. Likelihood: 4.78%.
The birds must have been attuned to the tension that gripped the hidden population of the Stark Enterprises Campus the moment the single car rolled onto its quiet streets. Their songs stopped and they listened instead, as if they could hear the murmurs going out across the S.H.I.E.L.D. communications lines, tracking the car's progress, checking each other's status, readying and on your mark. Their equipment was a little unfamiliar and too light, making the whole scenario even more surreal, making them feel just as much like recreated toys in this fake city. Magneto was welcomed into the hard edged, white building by men who kept their heads bowed submissively, speaking to each other in halted sentences, obviously unsure how to handle their patient's procession. Did they offer a bed? Would they die?
"S-sir, the room is prepared, through here..." one of them managed, guiding the Master of Magnetism through the halls where he would hopefully leave his son in the operating room. There was only them and the attending surgeon and his staff waiting for Magnus in the laboratory; not an Avenger or agent of S.H.I.E.L.D. in sight. Not until Pietro was situated on a bed and Magneto was instructed to allow them to prepare for the operation, out here, please.
Two more pairs of footsteps echoed through the sterile hall then, and a voice, murmuring to his companion until they rounded the corner and came face to face with their guest. "Magneto," Tony Stark greeted, smoothing his tie down his front in lieu of offering a hand to shake, then turned to present the man who had followed him, wearing a dark suit as well and carrying a briefcase chained to his wrist. "Hogan," was all he said, and invited him to unlock the chain with a curl of his fingers. "I appreciate your rapid attention to my demands," Tony went on congenially as Happy handed him the case.