He would have to be human, would he not? Determination is hardly a trait unique to humans, it is true, but there is something to be said for the steadfast nature of his resolve. His refusal to turn aside, even descending to Hell only sears your SOUL with flame, is reminiscent of -

Other things.

"Your interest has been noted." Calm and clear professionalism, with not a shift in their composure. Contained in an angelic smile, until the very last.

"Now." They tilt their head, neatly, to one side. "Have you anywhere else to be?"

They have no plans to turn their back, not now and not ever. That is how you get a knife buried there, sunk to the hilt.