Probably the initial roll to the left was a wing drop due to a stall or a botched correction to try and regain the centerline. In fact despite all the rubbish on this thread, certain people nailed it early on and there is nothing surprising in this report. The low speed handling characteristics were well described here. It seems it was the final proverbial straw.
But ultimately they were too low and too slow, below the DH without sight of the runway.