Billy's heart gave a bit of a flutter at the sight of the transporter. This was how he was going to find Teddy. Yes, helping other people and protecting the world, but his main goal here was to figure out where the hell it was Teddy had gone.
It was strange being on a new team. The fanboy in him had peeked at the introduction of Shadowcat, though Jack was less familiar to him. He felt a bit awkward, being the youngest, and knowing Fury very well may have told them he was bat shit crazy. And so he kept quiet, looking the machine over, lips giving a bit of a quirk at Jack's teasing, and looking curious at Kitty's question. That was a good point.