Viewing the vid when it was up a couple of things stood out. Firstly it didn't look like a full load, maybe they were only carrying 8000 litres or so. After the drop the aircraft continued much the same attitude then had a sudden pitch up and initiating a roll at the same time, then appeared to level out before it seemed (Could have been other side of smoke) to go into the smoke before descending a couple of hundred feet to impact. If there was any retardant left you would think there would have been traces in the impact site.