Saw an interesting comment somewhere - someone sitting behind the Georgian in-goal said that the ball came off the side of the Georgian kicker's boot and initially looked like it was going way out.
Unfortunately, there was a gale blowing in Sydney, and the ball swung back in late and then took a huge Nathan Lyon off-break when it bounced back to the chasing Georgian.
Probably explains Lancaster, trotting along, but he also got pretty unluck and caught in no-mans-land with that horrible bounce
2:05:14 for the front-on-camera angle on the Stan coverage