No stop?

I feel like an idiot right now… I was showing a co-worker a simple loading example - I have this simple script on frame 1:

trace(“a”);
var a:Loader = new Loader();
a.load(new URLRequest(“Untitled-1.swf”));
stop();

The movie just traces out “a” continuously. WTF? If I load an image file it stops… the swf being loaded also has a stop in it.

Sometimes ya feel like a newb…