I've had an interview like this in the past. At the time, I chalked it up to a power trip and the indignant behavior that comes along with it, as it is especially embedded in the culture of the country that I'm based out of.
Having said that, talking to a relative, I found out that this style of "interviewing" is often done when they already have someone for the position, but need to show (for compliance reasons, or otherwise) that they tried finding candidates, and only their preferred one qualified.
Having said that, talking to a relative, I found out that this style of "interviewing" is often done when they already have someone for the position, but need to show (for compliance reasons, or otherwise) that they tried finding candidates, and only their preferred one qualified.