Because Rishda, Shift, and Ginger can no longer use Puzzle, they invent a new scheme, which is every bit as blasphemous. By combining Aslan and Tash’s names, Rishda is suggesting that the values of the two deities are the same, which they are not. To make matters worse, Rishda has also foiled Tirian’s plan, once again diminishing the Narnians’ chances of success.