Final answer:
Loki is suspicious of Thrym in 'The Theft of Thor's Hammer' because Thrym suddenly acquires the wealth to ask for Freyja's hand in marriage, which leads Loki to suspect him of stealing Thor's hammer, Mjölnir.
Step-by-step explanation:
I'm afraid that there seems to be some confusion in your question. You initially ask about Loki's suspicions towards Thrym
in the Norse mythology story, 'The Theft of Thor's Hammer,' but the reference information provided seems unrelated and pertains more to Thor's hammer in the context of a scene from 'The Avengers' 2012 movie.
In 'The Theft of Thor's Hammer', Loki becomes suspicious of Thrym because Thrym suddenly has the wealth necessary to ask for the goddess Freyja's hand in marriage - a wealth that he didn't previously possess.
Loki suspects him of having stolen Thor's hammer Mjölnir, which is eventually confirmed.
The scene from 'The Avengers' movie, where Thor throws his hammer at Iron Man, and the related kinetic energy, though fascinating, doesn't pertain to Loki's suspicions towards Thrym in Norse mythology.
Learn more about Norse Mythology - Loki's Suspicion