So his last words was in reverse, so you thought he did not chosen his words wisely, but he did. In reverse. He said this in reverse "A-X-O-L-O-T-L, my time has come to burn! I invoke the ancient power that I may return!". Weird right, but what does the axolotl do about this, so in Dipper and Mabel and the Curse of the Time Pirates there is a powerful creature that is a axolotl, so did bill call for that creature.