First of all, we must clarify the plot of Thor 2. After new york War, Loki was escorted to trial by Thor, but the dark elves made a comeback and sought revenge on Thor. Only one person knows the dark elves, and that is Loki. So Saul turned to Loki for help and embarked on a journey to save the universe.
And Loki is a contradictory person. He is neither an absolute good man nor an absolute bad man. He wanted to compete with his brother for the throne, so he created such a suspended animation.
I don't know if you still remember, Loki is very good at using illusion, which is the basis of everything. The image of piercing the chest was caused by Loki's illusion, which he hoped people would see. He used his own death to deceive his brother and everyone in the palace, making everyone think that he was dead, so as to relax his vigilance and seize the throne.
Therefore, it makes sense for him to tell the news as a soldier. On the one hand, this behavior can make everyone more convinced that he is dead. On the other hand, he can watch secretly and wait for the opportunity. The reason of "finding Loki's body" is really convincing.
But then he became Odin and bid farewell to Saul on the throne. I wish he hadn't killed Odin. In the final analysis, the simplest reason is that he has no ability to kill his father. In fact, the lack of ability is also reflected in another aspect: Saul has long believed that his younger brother Loki ascended the throne, not his father Odin, so he repeatedly stressed that he was actually reminding Loki in disguise. Odin didn't show up, it must be because he was restricted, so he should be under house arrest by Loki.
Loki was so obsessed with the throne that he pretended to be dead to achieve his goal. But in the face of the enemy, he will still keep a heart with his brother. It's really a character that people love and hate.