1. Dispel is random. One of the five spells will be 'attacked' by the dispel. If that particular spell is too powerful it remains.
2. All globals are cast simultaneously. If you give an order to cast a global it will still be processed at the same time as the AI's newly cast spells. Thus yuo and the AI both compete for the single empty position. In this case the AI won and your spell randomly 'attacked' one of the now five global spells.
3. Sure about this? Sounds like a bug.
4. There are chances
