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Trouble awaits Nick and his mother, Kelly, as the two Grimms carefully walk inside the warehouse where two FBI agents were murdered. Marnassier, the Mauvais Dente, lurks in the darkness and suddenly appears to attack Nick. The creature is too strong for Nick to handle after he loses his gun underneath a machine. Kelly appears ready for battle and joins the fight to harm Marnassier. Nick and his mom manage to insert a knife into the creature's neck, killing him, but there's little time to clean up the mess because Juliette is at the hospital and needs some important medicine.