Nail said:
Are you sure? Is the spell
Blur in effect on a
Mirror Image figment?
If your answer is "yes", then the spell has most definately targeted a figment. And....Blur can only target creatures. It can't target figments.
If your answer is "no", then we get the same result: no
Blur on the figments.
Let's try something else:
Suppose there is a rat in your pocket. You cast
Blur on yourself. Is the rat
Blurred?
But suppose the rat is your familiar, and you are a high level wizard. Is the rat
Blurred?
Now answer this: What special power allows the rat to be
Blurred? Does a
Mirror Image figment have that power?
There is a flaw in your analogy. Mirror targets you, but creates duplicates of your image. Thus, it duplicates your equipment, even though it doesn't affect objects, and can cast a shadow, even though it doesn't affect walls. It is true a figment is unreal, not quasireal, but it occupies a particular area in space, and if you are blurry, it is just as blurry.
My rationale is that even if the blurry parts of it do not coincide with the figment's own dimensions, they are still a legal function of the figment.
further, imagine that your duplicates are currently occuping the same space as you within a few inches. How is your image going to be blurred to appear some distance away if all your duplicates visibly occupy the same area, and it is apparent that your blurry image occupies the same area as well, due to the blurriness?
Can a duplicate be invisible, even though invisibility affects creatures? I would assume it could, since that is a change in appearance. If a figment's appearance can be altered by invisibility, surely it can also be altered to mimic the effects of blur.
Your appearance (including the space you occupy) is blurred, and a figment, being unreal, should be able to appear to be anything you are, even if that appearance is itself misleading. It involves the same processes whereby mirror images seem to cast shadows on objects, throw rays and other spells, and hold light sources with a convincing appearance.
Finally, consider the description of the spell itself. It says sight cannot be used to distinguish the duplicate from the original. Yet if only the original is displaced in space, sight can be used to distinguish the original. The first time an attack missed against blur, it would be visibly apparent someone had attacked the original.