when you're writing for a Fandom you like a lot, but don't think you fully understand based on literally every one of the Fandom blogs you follow saying things you don't agree with
And you're writing characters with the knowledge that you only know them based on how they act in battle and people's online descriptions of their other behavior
And then you see a post about the finale and realise you pinned them completely
Martyn doesn't understand the supernatural, but if he's given the ability to he will hear it out. Even if he's cautious to trust he gives his loyalty when it matters most.
Ren hates the idea that the supernatural is understandable. He sees the act of giving it the light of day as some sin. He has disdain for it, to the point where I would bet if Martyn had gotten turned there would be a rift between them that wouldn't have been crossed for the rest of the series.
I just wanted to write Martyn being aggressive and Ren being unshakable. And I guess that's the core of their characters' relationship with vampirism as a whole.