Saw that on Sky news this a.m. Lucky chap.
He left it very late to get out. Do pilots still suffer compressed spines etc from using an ejector seat or have they improved them from a few years back?
Not really ... he was doing a "high alpha approach" which is common at airshows .... simply put .. almost balancing the plane on the jet thrust, very little "lift" being generated by the wings at all, at around 100ft. Crowds like it as they get to see the aircraft at slow speed with lots of noise ....
Looking at the "stills", or pausing the video, it can be seen that one exhaust cone is fully open, the other pretty much closed. The cones move automaticaly depending on the thrust produced ... so it looks very much like he had an engine failure and lost all thrust from one engine (the one with the closed exhaust cone). As he is flying below Vmca - Velocity (minimum control airspeed) the flight controls (ruddder/aileron) do not have sufficient airflow over them to generate the forces to actually control the aircraft, which is why it turns then starts to "wallow". The pilot would know about the engine failure almost instantly, and from the pictures he ejects about 4 seconds after it occurs. About as long as it takes to realise "now or never" ..
As to back injuries, the modern pilot "lies back" in his seat much more horizontally than of old, to help conteract G forces. So on ejection as the seat goes with him the forces are "spread" along the back rather than being straight down it .. if you get my meaning. he'll still have some compression problems and a very sore neck I expect .. but should be OK.