How to Unthread a Bernina 550

One of my most beloved presents ever is my new Bernina 550 which I received this last Christmas.  I don't spend as much time as I'd like using my machine.  To refresh my memory, I end up having to consult my user guide.  I particularly find that threading the B550 is less than intuitive.  Now, when my Maine Coon, Felix, wants to help, it's nearly impossible to make any progress.  While I was pulling the thread down, he would bite it from the back and watch the bobbin roll and try to dislodge it. See him here preparing his next move!