The missed snowball startles Jack, but he shakes it off, and turns around with a mischievous smile. Somehow, this is entirely expected. He recognizes Misfit as one of the people who was here to greet him when he first ported in, so at least for the first few seconds, he's jumping in on her side. He gives a sharp whistle to try to get Yuffie's attention, before lobbing the first snowball at her.