jm69 on report from IB captain landing on parallel runway:
He also witnessed a large bird to the left and a smaller one to the right of the MD. He also witnessed the MD's roll to the left followed by "an abnormal and sudden roll to the right" of the plane before it started to fall. During the fall it yawed to the right. He also says he saw some flash on the left side of the plane (i.e. around the left engine/tail area).
The flash/bang reports continue intermittently and this was addressed many pages ago. The preliminary report suggests that there were no engine problems so it would seem, together with all other facts available at this time, this was indeed a compressor stall in the #1 engine as the plane yawed starboard?