Tony's reaction justified Nick's own opinions of Crystal's suspicious story and actions, and he was actually glad he'd brought Stark in on this. "What my friend here says is correct," Nick nodded and shrugged in mock helplessness as if the whole situation were out of his hands. That it was just the way things were and they had to accept that and move forward. A child asks 'why' and you tell them 'because I said so.' Why couldn't she see Wanda right away? Because Nick and Tony said so.
"So how 'bout you tell us what specifically you need Wanda for and, again we'll see what Mr. Stark and I can do to help you."