Even though I don't know who Fran is hiding from, Hill feels that the tone of those two dragons is a bit odd. They probably know something... They are obviously talking about Hill, but there are many strange undertones...
Moreover, why did Fran specifically emphasize that Golun's Claw would deal with him? So wouldn't the elders of the Black Dragon? Those two dragons obviously don't fear these powerful Ancient Dragons.
It's clear they have backing from dragons.
Just as Purwell entered the gray mist, an angry dragon roar emanated from the city behind: "Roar! Damn Fran!"
Hill silently glanced at his maternal grandfather: Was that a female dragon? Why is his grandfather always... favored by non-humans?
Fran firmly held his head down, not letting him look back: "The Black Dragons have peculiar notions; they love to create powerful Dragonborn... It's not about romantic entanglements at all; they would seek anyone as long as they're powerful enough.