Awesome that this is still being talked about. I'll consider it my finest post to date.
It seems that the consensus is to say something humorous, offer advice, then back off and watch the show, knowing that your conscience will be clear if something happens after that.
The simplest thing to do would have been to shout out not to take the kid off belay, and the danger that w/could cause. As usual, the simplest answer seems to be the correct one.
Now, I expect all of you to be shouting at stupid people this weekend!