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Yes, I can see it'S the string that cut her, those are part of her weapons system as well. As I said, I assume her eyes can capture in much higher "resolution" than a human's eye.

That she is held in place by magnetism is debatable at best. a) Pyrrha's blast forced the swords out, so it should have done the same to Penny. As to why it didn't, your guess is as good as mine, might have soemthing to do with aura. b) Penny straightens up right before the strings start to wrap around her. Not very consistent with being 'held in place' imho.
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