Vampires vs sunlight

Then there was a roaring sound, and I dimly perceived the west wall of the building collapsing, falling away in great, flaming sections of wood and brick. The blast I had sent spewing at Kelly had sliced through the ceiling, walls, and support beams. It must have weakened the structure of the entire building as it had.
Oops.
Sunlight flooded in, through the falling bricks and clouds of dust, the last rays of daylight, warm and golden on my face, painfully bright in my eyes.
Kelly screamed and, wherever her skin wasn't covered by cloth, from her chin up, mostly - she burst into flame. The light hit her like a physical blow, hurling her away from me. I became aware of a dull pain, uncomfortable heat on my cheek, my throat, where her saliva had coated my skin.
Everything was light and heat and pain for a few moments, and someone was screaming. I struggled up a moment later, peering around the inside of the building. Fire spread, a dull chewing sound on the floors above me, and through the missing section of wall I could hear sirens in the distance. There were smears of something black and greasy on the concrete floor, leading to the white van. The sunlight barely touched the back window of the vehicle. The side door stood wide open, and Kyle, his face still hanging in ragged strips, hauled something grotesque - his sister, her true form no longer shrouded by its mask of flesh. The vampire girl made keening sounds of agony while her brother pitched her into the back of the van. He slammed the door shut, a snarl rippling his split lips. He took a step toward me, then clenched his jaws in frustration, stopping just short of the sunlight.


Grave Peril, Page 153