To comment on Wallabie's query as to whether the cabin crew may have disarmed the doors, I have to say it is highly unlikely. In 8 years as crew, including operating on the A340, the only occassion when we would possibly put a door into manual is in a ditching (and then only certain doors etc).
Having been down to the hangar to blow slides for a C-check on a 737 I can confirm of the 2 doors we opened only 1 slide actually blew. Doesn't suprise me at all that a slide might not blow following an incident such as this.