Board Thread:Q & A/@comment-4097293-20150226082755/@comment-26235944-20150526034318

82.21.236.214 wrote: I'm not sure where you are going with this @lurkenfrau but we already know you can't take on someone else's appearance without some of their hair. The writers have already established this fact.

No. The writers established that that is how Adalind did it.

We don't know if that is the only way it can be done. We only know that is how Adalind did it.

82.21.236.214 also wrote: Elizabeth and Juliette took on Adalind's appearance, so there must be some of Adalind's hair in the potion.

Or perhaps...Elizabeth was powerful and skilled enough to do something else that had the same effect.

Elizabeth was shown doing other things that we haven't seen any other hexenbiests do...
 * Her eyes glowed and she froze a room full of people.
 * She brought her son back from death with a two-headed snake spell.

We also were made aware that she was doing this: We were given the impression that Henrietta may have been doing this too, because of the way that Renard talked about her age...but we don't know for sure.
 * She changes her own appearance to maintain her youthfulness.

82.21.236.214 also wrote: There was nothing in the potion to restore Nick's powers that could possibly have created a hexenbiest. And yet...that is exactly what happened. In the episode, Bad Luck, when Adalind got into Renard's SUV, she said that 'if Juliette was a hexenbiest, then Nick must have gotten his powers back'. She said this like the two things were linked together...like one thing meant that the other thing had to have happened.

The point I am trying to make is...we don't know how Elizabeth accomplished her spell to re-Grimm Nick. We only know that it worked. And we know that Juliette was made into a hexenbiest in the process.

Elizabeth told Monroe & Rosalee when they met at the hospital..."To beat a hexenbiest like Adalind, you need a hexenbiest like me". I have always thought that that was a curious thing for her to say..."to beat" Adalind.