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Situation: A wizard has confined a low-Will enemy in a walled prison using silent image. He would like to allow his allies to attack the enemies in the prison without the enemy getting concealment or the allies needing to roll to disbelieve. Therefore, he described himself as being ready to open a "window" in the prison in the blink of an eye, allowing the arrows and magics of his allies to pour in.
The question is, what kind of action would that be? Is it possible to edit an illusion outside of the caster's turn?
I would say that editing would be part of the Concentration—so, you can do it once, on your turn.
You cannot synchronize your illusion-changing with anyone, as that would require readied actions you don't have. As a sidenote, unless you open a decent-sized area on your turn, the enemies should probably get some sort of cover.
I believe changing the illusion is done while the wizard is concentrating, and concentrating is a standard action which is taken on his turn. I don't think he wouldn't be allowed to change (or even dismiss) the spell outside of his turn, as supported by this passage:
A spell that depends on concentration is dismissible by its very nature, and dismissing it does not take an action, since all you have to do to end the spell is to stop concentrating on your turn.
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I believe changing the illusion is done while the wizard is concentrating, and concentrating is a standard action which is taken on his turn. I don't think he wouldn't be allowed to change (or even dismiss) the spell outside of his turn, as supported by this passage:
A spell that depends on concentration is dismissible by its very nature, and dismissing it does not take an action, since all you have to do to end the spell is to stop concentrating on your turn.
Yeah - I've seen plenty of players having an illusory monster appear to take damage from arrows and stuff, and it seems to be common practice to allow that reactive alteration.
I don't think that quote quite supports the liberal interpretation, though - it says, "all you have to do is to end the spell is to stop concentrating on your turn." The last bit seems to be strongly defining dismissal as only on the caster's turn, though it doesn't take an action. Or perhaps I'm misunderstanding?