Thank you so much for your response.
Yes - it was the Minn play that I was asking about. I had watched the play, and certainly believed that the correct call was made . . . and I truly couldn't understand what Childress was thinking - in throwing the challenge flag. He later pushed the issue further - claiming that he knew about some 'special rule' that most people wouldn't know about, etc.
I was very interested in learning whether there really was some "little known rule", or if my personal beliefs about Childress' "attitude" is more likely correct.
I believe I have my answer.
Thank you -- very much.