Well, if anyone was going to start a fight, it didn't surprise Kurt that it would be Rogue. He telported off the steps to stand beside Pietro. He winced as Magneto tightened the metal around Wicked in response to his son's request and Rogue's aggression. This wasn't helping. "Show of good faith, at least let her breathe and tell us what exactly it is you're looking for." Kurt didn't know what it would mean for Wicked if they flat out told Magneto they probably didn't have what he wanted. Better to string him along and try to get Wicked freed than risk his wrath coming down on all of them.