Who would undeniably win, Lucian vs Thresh?

#Lucian:

• Range: 50m
• Speed of attacks: Assumed semi-automatic with both hands, with a projetile speed having the velocity of a bullet, or the speed of light if his "purifying light" isn't just magic condensed into a bullet shape
• "Purifying" bullets. I assume this means they can force a lingering spirit to move on to hell.
• At least above-average proficiency and accuracy with his weapon
• Nothing to lose except his own life

#Thresh:

• Range: 4m
• Speed of attacks: average or slightly above average rate for swinging a chain weapon, which is slower than a sword because of the drawback time
• Can use Senna against Lucian mentally, with whatever lies or truths he decides to tell.
• No actual training with his weapon of choice. He was a prison warden who used chains to torture, not for target practice.
• Possible self-defense training as a requirement for being a prison warden.
• Assumed he does not feel physical pain, so his physical strength _may _be several times above a human's, assuming the complete lack of muscle tissue doesn't weaken him. But perhaps Lucian's weapon can cause the undead to feel the sensation.

If we assume Lucian isn't a moron, he can win the fight from well outside of Thresh's range. Thresh, if it's assumed he has zombie-levels of strength, still isn't fast enough to dodge or deflect a bullet. He wasn't and isn't a superhuman, and he's not armored. It's basically target practice for Lucian if he fires often enough and from far enough away that he won't hear Thresh's taunts past the sound of his guns.

No contest, regardless of how much you like Thresh. As long as the purifying bullets can actually force the undead out of the physical realm, Lucian wins.

The reason Thresh could have reasonably beaten Senna and Lucian in the first place is because they were also completely surrounded by other undead inhabitants of the Shadow Isles. In a 1 on 1 fight, Thresh has no such help. That, or their guns don't actually work on the undead.