On Thursday, 17 November 2016 15:18:20 UTC, Dave Plowman (News) wrote:

He was on his way to a fire, overevved it and the pistons hit the valves
on the way down.

That doesn't happen by 'redlining' any engine. It's the sort of thing that
happens if you select a silly low gear at speed and *vastly* overspeed the
engine.

He actually missed a gear and floored it in neutral.