The man accepting Manus' challenge is what you might call a 'little person.' (He stands at 4' 11" tall). Like Manus, he has an extraordinary skill: He can hold his breath for up to three minutes! He therefore put himself in the 4'x2' fiberglass box. He held his breath while in the box to meet Manus' requirement of 'not breathing.' (Note that Manus said "not breathing" but he didn't say it couldn't be alive). Of course, he wasn't dead either, so he met that requirement. The man happened to be there on the occasion he heard Manus say that he never had anyone's blood on his hands as a result of this act. Thus, he knew Manus wouldn't even attempt the trick this time. He put himself on the line, and won. Oh, and as for changing color: The last time the man held his breath 2 minutes, he turned BLUE. Fortunately, it didn't go that far this time.