Final answer:
In Norse mythology, Loki uses his transformative abilities to bypass Freya's defenses and steal her necklace whilst she sleeps.
Step-by-step explanation:
Unfortunately, the information you've provided about Perseus and Medusa doesn't exactly pertain to the question about Freya's necklace and Loki in Norse mythology.
However, in the Norse mythology, it's often reported that Loki transforms himself into a fly to sneak past Freya's defenses and steal the necklace when she's sleeping.
Loki's cunning and use of transformation is similar to how Perseus uses the tools gifted to him by the gods, such as ,Athena's reflective shield and the winged sandals of Hermes, to overcome obstacles in his journey.
Similarly, Loki uses his skills and abilities instead of direct confrontation to achieve his goals.
Learn more about Norse mythology