The trickster speaks in dead voices. Perhaps the old man knows it's a lie. Perhaps he can't bear to let her memory die with the rest of the world.
Villains (or at least one of them is) for a concept thesis film I've been playing with about an egg that hatches after the K-Pg extinction. An old, blind Quetzalcoatlus lured in and commanded by an opportunistic Troodon that uses mimicry to speak in the voice of the old man's dead mate.
Unable to let go of his grief, he acts as a weapon for his companion in exchange for their sight and hearing her voice again.
Honestly Quetzalcoatlus is underused as a monster. Flying giraffe pelican that can fucking eat you on one bite and then fly away. That's honestly more terrifying that any dinosaur I can think of