Stroll already experienced in the book of driver excuses :-
"What happened to cause Lance Stroll's spin on Wednesday that has led to Williams cancelling today's test? Stroll himself was coy. "Unfortunately just a little thing at the end," he said. "A victim of a situation that happened on the end on the car, which just threw the car away from me. There was an issue on the car, I was a victim of the situation. We are still figuring it all out, so I don’t want to get into details about it."
What could it have been?
Williams engineering chief Rob Smedley was keen not to criticise the driver, but revealed it had been a mistake on cold tyres. “They are good to lean on them, but there is a certain point where they become very tricky," Smedley said.
"Lance was out on cold tyres, on a cold medium tyre, on an out-lap with a lot of fuel in the car, and the tyre stepped away from him. He was an innocent victim of that happening and what should have been an innocuous sideways moment brought him around into the barrier and did some damage. That happens and we expect it to happen there is no blame on his part.” "
So basically, inexperience caused his crash. Not allowing for cold tyres and a heavy fuel load. So not a 'victim of circumstance', a victim of his own over exuberance.