I was super impressed with the cool timing of the point to eject by the pilot.
It's not yet clear if the ejection was pilot or plane initiated.
The F-35B (The jump jet version that the UK have stupidly ordered) has an automatic ejector seat. If the plane detects a failure in the lift fan at slow speeds it can 'spit it's dummy out'. This is because there are two big columns of 'lift' air - one from the lift fan immediately behind the cockpit, and a second from the normal jet pipe nozzle that swivels to face downwards. If the lift fan fails, then the single remaining jet thrust from the rear of the plane will cause it to flip arse over cockpit quicker than the pilot can react and eject - think of a £100M Catherine wheel. Chances are the plane would be upside down by the time the ejector seat left the cockpit, and the pilot will make a nasty splat as he hits the deck/ground. So the computer times everything and chucks the seat out of the plane at the right moment - hopefully.