That in addition to everything else indicates that it was calculated to produce what they obviously wanted.
And after Andrea wins Jeff gives her the clue to the location of the hidden immunity idol. When has that ever been done before and why??? Was that to make sure that Reynold didn't then go back and dig it up and survive another week in the game??? If Reynold had won that challenge would Jeff have given that clue to him???
They wanted Reynold gone -- period -- and they were leaving nothing to chance either in the challenge or the possibility that he would find and play the hii.
I do believe Jeff announced the Clue to the III before the challenge started.