I don't think you can hide in the shadows while doing anything other than walking. If you try to pick up something, unlock doors, back stab, or perform any other activity, you leave the shadows. To back stab, I believe you hide in the shadows until you get behind the target then use the dagger for the attack. I haven't really tried to do that much. I tend to prefer bows and slings so I can attack from a distance. Hope this info helps.
Julianna
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