They interpenetrate as psiloi. Magic or unworking can take place at any time during your bound. All spells have a minimum aspect that is required for the spell to be cast, as well as a cost, in pips to cast it. Aspect represents the proper alignment of magical, spiritual, and s forces to create the desired effect, and is determined by the pip die role for the commander of the caster. For example, if a spell requires an aspect of four and a cost of one, then the pip die for that turn must have been a four or greater, one of which will be spent on the spell.
Any caster can spend one pip to attempt to unwork another's spell.
All magical operations require line of sight. Any amount of activity is allowed as long as pips are available. All spells requiring maintenance cease upon the death of the caster, or the will of the caster, or at the beginning of the caster's bounss maintained. Other spells are permanent unless unworked. Some part must start within 100p.