War and XPs dumb question (spoilers)

[Forbiddenwar]

I just got War and Xps, and one of the bonus strips confused me.

In 310b, why did Eugene disappear after saying he would never leave?

[RMS Oceanic]

The spell that the Azurites cast would release him back to Celestia whenever he obeyed an instruction. Shojo tricked him into obeying his request to repeat himself.

Does that help?

[Andore Mordre]

I was wondering about that too...thanks RMS.

[spoiler]