Strange casting order

[Endoperez]

MaxWilson said:
She's A1, so she can't use two gems.

Exactly. Amount of gems that can be used == your level in the path in question.

Power of the Spheres, wait few turns until fatigue drops below 100, Wind Guide would have worked.

[Renojustin]

I could swear that they have been casting it other than that one incident.

[Endoperez]

If so, it's a bug that only manifests under special conditions. Or you used communion or Storm Power or something else.