What does look strange from the replays is what exactly happened to Marco which caused the accident, he was hanging off the side of the bike which caused it to swerve across the track and down in front of Vale and Colin.
Didn't look like the usual sort of lowside as he would have slid outside of the corner onto the grass.
one of my first thoughts was "no way his helmet should have come off, poor helmet design!" but I guess all that hair is going to influence the fit.
a couple of races back, the commentators on Eurosport where joking about that very same thing, how does he get a helmet to fit with all that hair, which has turned out to be sadly prophetic.
RIP Marco, such a bloody shame.
One of the other riders thought it had been red flagged due to rain, so it's possible the track could have been damp and he just lost control.
I'll be honest, it sounds as if it was anything but 'quick', the reports make it sound like he was still alive but in critical condition when he was taken to the medical facilities.
RIP