The enigma is multi faceted, but chief among those questions is, why would the last sentence necessarily be any different than starting a new board? Or at least, any different than Roll a D20? Obviously there is a chance of a match, but what we saw on Nalthazar's video was nearly impossible. He had to have made five at least three matches in one cascade, and more than that: one of each colorof three colors. Any of the five colors, but three different ones.