Who?!

A young man in a purple graphic sweatshirt stands in a doorway, reacting with surprise and distress as a woman gestures toward him; he clutches his chest and looks shocked, then the scene cuts to a close-up of a man's face shouting, followed by a black-and-white shot of a mouth open in a scream, and finally returns to the young man looking stunned against a background with a green heartbeat line.