He lost traction, took his foot off of the gas when it scared him, and the rear wheels slowed down. When they slowed enough to regain traction, they pushed the car straight in the direction it was pointed, due to the slide causing the car to swerve, because the driver did not uncouple the drive-train from the engine.
It is a real problem with automatics; you have to be able to get to uncouple the motor from the drive wheels quickly either by clutching or getting into neutral to avoid the slowing tires hooking up again while you are pointed in a bad direction.
I know the F1 automatic of Ferrari allows the operator to pull both paddles simultaneously to go straight to neutral while in manual shifting mode.
Does the A8 have anything like that to enable the driver to get into neutral as fast as possible? I only have a GS/M6 and no experience with this particular automatic.