Rime-blooded arcana and Frostbite Spell?

[Katydid]

You can find the descriptors for the sorcerer Rime-blooded Arcana and druid/magus/witch Frostbite Spell here and here, respectively.

See quotes from the Bloodline Arcana:

Rime-blooded Arcana wrote:

Whenever you cast a spell with the cold descriptor, you may select one target of the spell to be slowed (as the spell) for 1 round. A Fortitude save (DC 10 + the level of cold spell + your Charisma modifier) negates the effect.

And the transmutation [cold] spell:

Frostbite wrote:

Your melee touch attack deals 1d6 points of nonlethal cold damage + 1 point per level, and the target is fatigued. The fatigued condition ends when the target recovers from the nonlethal damage. This spell cannot make a creature exhausted even if it is already fatigued. You can use this melee touch attack up to one time per level.

By definition, the target of the spell is the creature touched. No ambiguity there. But working out how the targetting functions with the arcana, if you multiclassed or went Gestalt, is a bit more puzzling.

Issue #1 - Are casting/targetting simultaneous or separate time requirements? Here, the target isn't specified during casting, it's what you hit from the touch attack. Do you pick the thing you're planning to hit ahead of time for the arcana, or would this work on anything you hit? Would it not work at all since it's not "whenever you cast the spell?" What if you were a Spellstriking Magus attacking immediately after casting?

If the requirements are separate, what happens to Frostbite, which scales by 1 use/level?

Issue #2 - How often would it apply? "You may select one target of the spell to be slowed" suggests, RAI, a single target. So no (1) Frostbiting/slowing multiple enemies... I think. Would the arcana (2) Expend itself in one hit, causing one save and one 1-round slow on failure? Or if you slap the first creature over and over, repeating the targetting process but still hitting this one target, would the RAW rules enable (3) Application of the arcana multiple times to one opponent, causing multiple saves and 1/round slows?

Even if (3) worked I suspect DMs wouldn't allow it. But I'm extremely curious as to what would happen.

[Zhelgadis Graywords]

My understanding of RAW is that the first creature you hit gets slowed for 1 round. That's all. (nasty effect, though.)

[Kazaan]

Basically it means if you have multiple simultaneous targets (ie. AoE, multi-ray), you only rime one. But for frostbite, you should be able to rime each target you hit.

[Majuba]

You only get to slow one target, as you're only casting the spell once. I don't think a GM would care if that's the first person you hit, or the last, or even the second time you hit the same target (though that may be outside a strict reading).

[Cevah]

Kazaan wrote:

Basically it means if you have multiple simultaneous targets (ie. AoE, multi-ray), you only rime one. But for frostbite, you should be able to rime each target you hit.

No, you get one slow per spell. Pick one target of the spell to apply it to.

/cevah