Time Stop has some unclear aspects. The spell will be handled in the following manner:
1. Any spell that damages any target outside the effect of the time stop cannot be cast during a time stop. Ex: A wizard could not cast time stop, then cast fireball, cone of cold, and chain lightning, and have the spells affect his enemy once the spell ends. However, he could cast time stop, then place protective or healing magics on himself, or targets other than himself.
2. Haste will not stack 'inside' the time stop. Being hasted is a similar spell-effect to time stop so the more powerful spell overrides the lower level spell. This means that the d4+1 of rounds of action within a time stop do not grant them the extra partial action each round, as with normal hasted actions.