That was an awful non-call by the refs and I am not a Lions or a Texans fan but I hate to see any team lose because of terrible calls like that one (unexcusable!)! But, I will agree with you that I don't understand why all the Lions players just stopped on the play. I am pretty sure that most coaches (Pro, College, High School, Little League, etc) teach/tell their players that you do not stop on a play until you hear the whistle! I told my dad that was one of the worst calls (non-call) I had ever seen in an NFL game and the League officials should be totally embarrassed by that non-call but I certainly didn't understand why the Lions total defense just stopped on the play without hearing the whistle!