Acrobat X Pro - closedoc method doesn't close the doc immediately in loop, why?

// Loop to create and save 10 PDF documents
for (var i = 1; i <= 10; i++) {// Create a new PDF document
var doc = app.newDoc();

// Save the document with the appropriate file name
var fileName = "/C/temp/test" + i + ".pdf";
doc.saveAs(fileName);

// Close the document
doc.closeDoc();
}

// Inform that the process is complete
console.println("Creation of 10 PDF files completed.");

That is my sample code above, when you run it, you can see all 10 files created, saved and then all 10 being closed at the same time. Why is this? Tested this in both in console and as a JS action.

After each file is created, that doc should close. I tried reading the SDK manual but there is nothing in there except for this:

It is important to use this method carefully, because it is an abrupt change in the document state that can affect any
JavaScript executing after the close. Triggering this method from a Page event or Document event could cause the
application to behave strangely.
In versions of Acrobat earlier than 7.0, a document that closes itself by executing this.closeDoc terminates any script
that follows it. In Acrobat 7.0, the script is allowed to continue and to terminate naturally. However, if the Doc of the
closed document is referenced, an exception will be thrown.

Any help is much appreciated. Thank you~

V