There was an instance when Amon thought this invitation was a trap. However, he felt it was too unlikely. He was a registered kingdom official. This was a formal invitation. His people knew he was invited here. If anything happened to him, Prince Huang Zhan had to answer for it. Even if Huang Zhan was a prince, he would not be free from punishment. He could even lose the right to enter the Ancient Ascension Trial.
These considerations gave Amon the confidence to come here alone.
Even so, he didn't panic about these unexpected circumstances. Right after the soldiers displayed their hostility, Amon also acted. With one swing, he threw multiple flying knives that flew in all directions. Simultaneously, he jumped upward as he unfurled his ceremonial dagger.