'Late Night with the Devil's disturbing ending, explained

A horror movie set during a late night show gone wrong is a concept so good you wonder why it hasn't been done already. That's the premise for Cameron and Colin Cairnes' Late Night with the Devil, a found footage/possession mystery that gained positive attention last year at SXSW before recently becoming embroiled in an AI controversy over the use of three interstitial images.The movie itself is a twisty one that revolves around a supposedly possessed little girl called Lilly (Ingrid Torelli), t