Devil’s on horseback

On this Wikipedia the devil’s on horseback links are at the top of the page across from the article title. 2010 American supernatural horror film directed by John Erick Dowdle.

A Bible verse, 1 Peter 5:8, appears onscreen. An unseen man narrates with a story about his childhood, where his mother explained the circumstances that surround The Devil roaming the earth. A man jumps to his death from a skyscraper, leaving a suicide note about the Devil’s approaching presence. In the elevator, the lights frequently flicker and turn off completely for intervals. During an interval, one of the security guards, Ramirez, watching through the security camera sees a face on the monitor he believes is the devil, but his partner Lustig doubts it. At the same time, the young woman feels something on her back and the group becomes suspicious of the mattress salesman. When the lights return, the young woman has a bite mark on her back and the salesman has blood on his hands.

The lights go out again, and the elevator mirrors break. When the lights return, the mattress salesman’s jugular vein is impaled with a broken mirror shard and he dies, escalating it into a crime scene investigation. Outside, security guards, the repair technician, and the fire department attempt to get in, to no avail. Bowden and his partner use the sign-in sheet and elevator camera to identify the group. The temporary guard is identified as Ben Larson, who has a criminal record of assault and beating someone into a coma.