What scheme does Artemis cook up to get his gold and his mother well?

Artemis knows how to avoid the time-stop which will help Juliet, Butler, and himself escape the blue rinse. But first, Artemis makes a deal with Holly. He will give her half of the gold in exchange for her magic to help heal his mother. Artemis causes Butler, Juliet, and himself to sleep thus tricking the time-stop and not exposing them to the blue rinse.