Only after the target leaves the area

Only after the target leaves the area is a mitigating condition introduced for Reduced Duration.
Power-Ups 4 incorporates it when designing the Aura of Power "special enhancement", a meta-modifier collecting several enhancements and limitations.
The effect is that the standard discount for a 1/60 duration worth -35% only gives a discount of -30% if the duration is not reduced while the target remains in "the area".
How to interpret this isn't initially 100% clear in the crunch since there could be a couple takes:
#the area targeted at the time they succumbed to their initial failed resistance roll (fixed)
#the area targeted at present moment in time (mobile)
The 2nd interpretation being the correct one is supported by the followup fluff:
*Those blessed stay that way until they leave the area or the aura ends
Due to the aura ENDING causing the duration to crumble, this shows it is something affected by the ongoing use of the power, so it would make sense for it to require proximity to the aura-generator as they move about, rather than proximity to the location where they were initially affected by the aura.
The expression "leave the area" thus refers to "moving away from the user of the Affliction" (and the area they are generating in that present moment: they are effectively "reinforcing" their duration by proximity) rather than moving away from the place the user used to be.
The "stay that way" approach is a result of there being a minimum duration of 1 minute while in the aura: the assumption is being made that someone will not possibly make 60 consecutive successful resistance rolls.
This is somewhat problematic though as it is entirely possible for someone to just barely fail a save with the worst possible roll (an 18: 0.463%, or one in 216) and yet have such amazing bonuses that they DO pass 60 consecutive rolls and stop succumbing to the aura prior to exiting it.
Category:Enhancements
Category:Mitigators