Astrologian Speculations! How will it fit in?

[Roxas_Andrade]

If you notice, the stun effect doesn't appear until she uses the AoE spell. There's likely no animation for when it gets activated by the AoE spell, but after she used the debuff, the enemy wasn't stunned. It was only stunned after she used the AoE spell. That's why I see the AoE spell as the activation ability.

Or the spell cast by the AST was Paralyze. That's why it didn't had an instant effect and that's why it didn't require activation. it just 'ticked'.