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In SR4 rules, the poison is technically a Power that you're activating, so I think that works fine. As for the rest, I'm as curious as you. smile.gif
Indeed, it's a critter power, that reasoning is good. That means for poison, that it still remains, when the sustained spell is dropped.
Well, "giving wool" is not a critter power (I think), but I think that wool shouldn't be treated differently than poison. And seperated limbs should't be treated different than wool. That would mean that all seperated sustances from a transmuted being would keep their form permanently.
Of course different substances, could be treated differently, but that would lead to a total confusing mess of rules. And all without the author of the spells loosing a single word about it. They can't expect us to conclude if a seperated limb/hair/poison drop remains or changes back, if it all is handled differently.
On the other hand, the author surely never though about the problem.
Anyway: From this argumentation I conclude, that when you cut pieces out of the goo, and then end the sustained spell, the transmuted person will be missing some bodyparts, but the off cut piece will remain goo. Nothing you could reattach in a hospital.
And I conclude that the price for wool has dropped since the awakening