That photo.... telephoto lens......looking down the runway.......the runway end could be 1/2mile from the aeroplane but it looks right over it! On a limiting runway, you may only be able to cross the runway end at about 30'. With engine fail at V1, it comes down a bit. Can't remember the figures. After over 2 miles of thundering down Nairobi at full power in a Classic, we only used to cross the end of the concrete at about 50' on the radio altimeter. It's all there in the performance calculations, and they are right as opposed to human judgement. Calling V1 at Bombay on a really heavy/hot T/O, I was amazed how little runway was left, and reported that I didn't believe the performance was correct. The BA Performance Section wrote to me showing it was right and we could have stopped in the space available. I didn't believe it. The week after I got their response, another 747 of ours, with one reverser locked out, same circumstances, lost another engine and abandoned at V1. Heavy/hot/2 reversers only, and stopped with 100 yards to spare.