For a moment on Sunday night, UBS Arena went silent as young defenseman Kashawn Aitcheson crumpled to the ice after a center-ice collision with Flyers defenseman Noah Juulsen. The 19-year-old immediately grabbed at his leg and needed help off the ice, putting no weight on it-a frightening scene for fans in his first preseason game. Fortunately, the injury wasn't as serious as it appeared.