If a Hexenbiest ingests the blood of a Grimm, their Wesen part will be destroyed and they will become a normal human. The weakness is common knowledge amongst Hexenbiests, but seems to be closely guarded from outsiders. Since Adalind was visibly shocked when she realized that Nick knew about it, it seems that even Grimms generally don't know about it. A Hexenbiest turned human in this way still retains her knowledge of Zaubertränke and can still create the most dangerous of concoctions. (REF: Grimm Wikia: Hexenbiest)
Jag misstänker att frågan är: Kommer Juliette att berätta för Nick i god tid eller kommer det att dras ut för att suspensiva betyg ökar ...