So, I remember there being a spell in Death Masks that took a while to hit- snakes crawling after harry. Now, it could've been a conjuration, and that was just the snakes crawling... but what about a creeping fog, or slow moving spell that operates more like evocation otherwise?
It came up recently in a game, and my off-the-cuff, 'we can't find anything quickly in the book, and don't want to waste time figuring it out' ruling was to give the spell an extra 2 shifts of effect, to balance out the fact that the players had a round to run away, counter it, take cover, or put some nifty defensive aspect on themselves with a maneuver.
Later I got the chance to think about it, and realized that over 2 rounds, the caster (power 6, control 7), could've put 2 aspects on himself with a maneuver for a -1 roll or better ("Charged up" and "Focused Mind" both for a single round), and then tagged them both on the next round for 4 extra shifts. It would've cost 2 stress instead of 1, and taken the caster's action for both rounds... whereas I had the caster use a no-stress supplemental action on round 2 to maintain the spell, and he took the chance to run away.
I'm trying to use that as a litmus test to figure out if my off-the-cuff ruling was reasonable. For NPCs, it may not matter- just storytell and move on, but my players may be interested in trying something like this themselves at some point, and I'd rather have a well-thought out semi-hard ruling on it than another off-the-cuff guess that may or may not even line up with what I've used before...
While I was at it, I had this as a thought:
If the caster in question were to try to use a maneuver to place a single, one-round aspect on himself, he'd be a shoe-in. Even at a -4 to the roll, the worst possible, he'd roll the standard difficulty. If I were willing to allow him, off the cuff, to do a maneuver spell as a supplemental action at worst possible outcome, that would give him a 2 shift bonus, and free up his other action. He's still spending 2 stress instead of 1, but I still haven't accounted for the delay, and I could simply fold that stress reduction in as the benefit. This of course, depends on whether or not the idea of allowing a -4 discipline supplemental spell is kosher, and for that, I have another thread, but I'm also starting to see similar lines of logic... and in math at least, when you can solve a problem 3 different ways to the same result, it's generally safe to call it proven.
So... thoughts?