As one has said, a staggering happening in this day and age. I spoke to an SEP trainer of another airline and their normal procedure is to close doors AFTER steps have been removed. This might have prevented this accident, but then you have the scenario of a slightly built C/A trying to close a heavy difficult door balanced high above concrete firma. Considering all the trivial B.S. that Health & Safety throw at us on a daily basis, this seems a mighty oversight. Or could it be that itn is ignored because there is no 'quick fix'. Imagine what would be required for this operation in other jobs; at least a safety harness for the operator.
From memories the metal strip on the bottom door frame of Boeings, no doubt to protect against the millions of SLC's that will use the a/c, becomes a skating rink with the slightest drop of water. Certainly I've seen C/A's using it to brace their foot against when closing the doors, and nearly launching themselves overboard when it was damp.
I wonder what the insurance claim will look like, and by whom.