[Supersonic]

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whats the deal with nathans reflection?

whats the deal with mama petrelli? whats her power etc.?

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These two have not been answered in the show.

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what exactly are the twins powers?

did all the elders have powers?

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These two have not been explicitly answered in the show, but it seems that every elder we know about has had a power, although Nakamura may not have had one.