A couple of questions regarding duration and prolonging spells, mostly blocks but can apply to other stuff aswell.
Exchange 1 - My wizard casts a Air evocation block, described as a column of super-turbulent air that throws off any incoming attacks. I assign no shifts to Duration however.
Exchange 2 - As long as nothing broke through the block, I can prolong it now, right?
Or, If I instead assign one shift to Duration in the first exchange it can go:
Exchange 1: Block, 1 shift to duration
Exchange 2: Attack/Maneuver/whatever
Exchange 3: Prolong the block, assuming nothing broke through
Is that right?
And the above is regardless of if it's a Rote or "normal" Evocation, correct?
For Redirecting spells (like Ramirez Shield-to-Attack) - it needs "unspent" shifts of duration to work, right? So in my second example above, I could redirect the energy in Exchange 2 but not 3?