Andrea Iannone was staring straight at Johann Zarco's Tech3 Yamaha as it reared up and began bouncing down the track, following contact with Marc Marquez at the end of the 200mph Phillip Island main straight.

It was enough to scare even 'The Maniac', who went on to finish the Australian race in second place for Suzuki, behind Maverick Vinales.

"I was really scared because at that point we are going really fast and when I saw the bike of Johann from behind I knew it was a big crash," said Iannone.

"I braked really strongly to avoid contact with his Yamaha. I was really lucky because it was really, really close.

"I don't know why [the incident] happened because I didn't see. But in any case, I'm really happy that Marc and Johann are also okay because this situation could have ended in a completely different way."

Zarco was unhurt despite being thrown from his machine during the lap 6 incident. World champion Marquez kept control, but was forced to retire due to damage on his Repsol Honda.