Food for thought, the "bulkhead" separating the cockpit from the rest of the cabin is obviously not designed as part of the pressure cell. If the door has been beefed up sufficiently to prevent an aggressor entering the cockpit and should it remain (or try to remain) in place during a rapid decompression via the cockpit area then the parts that will not remain in place will be the toilet and galley backwalls. Seeing that the OČ masks are situated slightly to the rear of the crew and are accessable via a small cover door that has to be raised in order to gain access which could be prevented by debris from the backwall failure. If the main cabin evacuates via the cockpit there will be massive movement in this area. Lets hope the CVR and FDR throw some light on this tragedy