Some of the fallen angels I see have white wings like angels, while others don't. There is almost no difference in appearance from spirits in the spirit world. They may appear during conversations with spirits in the spirit world, or may speak as if they were humans who have passed away. So, if I don't check carefully, I might mistake them for a deceased person.
For example, many Western intelligence agents who died young were as beautiful as angels. Fallen angels sometimes pretend to be humans and come among them. As I repeated the questions, I realized that he was saying random things that didn't make sense, and later I realized that he was lying. It's like a weather vane.
In other words, he is a member of the devil's army, but devils can change into various forms at will. No matter how he changes his appearance, the devil can only lie.