Okay, so based on this, I now have a new theory
What if when Emma gets stabbed with the sword (assuming it’s the same sword as the one in her visions???) only the dark part of her dies, and that the dark part of her needs to die to perform some huge task, or to stop the savior shakes? Like the savior shakes are caused by the battle of good and evil (esp. Dark One evil) within her? Either way, being stabbed ensures her continuation as the Savior with only light magic and goodness inside her?
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Keeper of Regina's bravery