The phone tells you the sequence every time. You double-press the button, it shows the FaceID prompt. You authenticate with FaceID, it tells you to hold it near the reader.
Yeah, but it doesn't tell you the sequence all at once. So you don't know that it's going to tell you to hold near reader, but you know that it needs to be held there, so you try to hold it there while you authenticate, which is at the wrong angle for auth, so it fails, so you click the button again, which this time turns the screen off...
