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So, I've been looking to give a Huge size creature the Sky Swim spell- however, it has a target limitation of a Large creature or smaller. If the Huge animal was reduced in size by Reduce Animal prior to Sky Swim being cast, then Reduce being dismissed? Does it become a Huge creature with Sky Swim, or does the spell cease to function?
I'm asking in regards to PFS specifically. I'm not aware of any rules on how this would work.

Feegle |

This is a different question, but it's the same topic as in the subject line, so I'm going to add it here for ease of searching later.
When are you allowed to choose a target?
The situation was this.
1) Caster begins casting Enlarge Person on a specific ally (declared as "I start casting Enlarge Person on Honder; next round he'll be size large."
2) Enemies drop a Darkness spell
3) Caster finishes casting.
Does Enlarge Person work? The target is, for all intents and purposes, invisible when the spell completes, but was chosen as valid.
The only quote I can find in the CRB that seems relevant is this one:
Target or Targets: Some spells have a target or targets. You cast these spells on creatures or objects, as defined by the spell itself. You must be able to see or touch the target, and you must specifically choose that target. You do not have to select your target until you finish casting the spell.
Argument 1 (for) "You do not have to select your target until you finish casting the spell" implies that you can select your target when you begin, if you want to.
Argument 2 (against) "You must be able to see or touch the target" implies that it must be true for the whole length of casting, in this case 1 full round."Argument 3 (against the against) "You can choose a target that you weren't able to see when you started casting, but can see at the end of the cast by not selecting the target until then, therefore you don't need to see the target for the whole length of casting. By extension, you can choose a target when you can see them, at any point during the cast."
Anyway, at this point you can probably see the rabbit hole. Opinions?

Melkiador |

Some spell's change the type of its target's type. Animate Objects is cast on objects which then become creatures. They stay creatures even though they are no longer legal targets for the spell since they are no longer objects.
We can take this to mean that target is only checked at time of casting and doesn't matter from then on.

Feegle |

Feegle, you do not 'begin casting Enlarge Person on a specific ally'. You begin casting it. The target is not chosen until the spell is cast.
You quoted the relevant rule "You do not have to select your target until you finish casting the spell."
"You do not have to," is not the same as "You cannot," or "You do not;" and "You do not have to select your target until you finish casting the spell," is not the same as "You choose your target when you finish casting the spell."
I suspect that this will end up a house-rule, but I was wondering if there is actually a clearer rule written somewhere. It's for a home game, but my years as a PFS GM have taught me to look for absolutes in the rulebook, and not implications - hence my question. :)

Brf |
How about this quote from the Casting Time section?
You make all pertinent decisions about a spell (range, target, area, effect, version, and so forth) when the spell comes into effect.
it implies you do not make the "decision" about the target until the end of the casting time.