Jet efflux
Not too sure about that, or at least she was rather on the thick side not to react during the spool-up time...'5,000 degrees' ? Even in fartingheight it sounds a bit high.
Plenty of people have been blown over etc by efflux; at Dunsfold a fitter was left with a smoking coat ( not in the Noel Coward sense ) when a Hunter pilot took a short cut - result one b----cking for pilot, who was not one of the regulars.
On the other end of the engine, I heard there was a photo on the Ark Royal of a chap halfway down the intake of a Phantom, only saved by a chum who'd grabbed his legs.