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Originally Posted by Kaijo

What do you mean, not perfected? What is the information that changes the nature? Still waiting on subs myself, because last time I listened to what people said about the episode, it turned out to be not quite true.

Edit: and to be clear, we (and the girls) knew that becoming a magical girl meant you'd fight witches as long as you lived. It didn't seem to be something you could get out of (although we often raised the point about what would happen if a girl simply decided to stop fighting; what forces her?). In return, you get a wish granted and magical powers. Some might not make that bargain, but some would. To me, it comes down to personal choice.

Spoiler for episode 6:

From what I gather in this thread, as I haven't watched the sub yet, it appears the soul gem is their actual soul, so they become something akin to liches with a phylactery; their bodies become empty shells. They die if their soul gem isn't kept recharged or is somehow lost.

I highly doubt the girls would've accepted the contract if they knew this information.