In Priest (2011), why is the sunlight not affecting the vampire in this scene?
I believe that character is Karl Urban's 'Black Hat' character:
From your link:
Black Hat is revealed as one of the Priests who was defeated in the final attack on Sola Mira and a close friend of Priest. After being captured, the vampire Queen gave him her blood, turning him into the first Vampire-Human hybrid who can survive the sun.