D O Guerrero:
Aircraft approach at a speed which gives them a margin above the stall speed (usually around 30% higher). In an emergency such as this, this 30% extra speed can be traded for height and therefore 'stretch' the flight path compared to that which would result from flying 30% above Vs with no power. It is a measure which has only a limited life, since once the stall speed is close the nose must be lowered again to prevent the stall. Then the aircraft is committed to where it will end up. It needs fine judgement and the failure to occur not before a certain point for it to work and the aircraft to reach the field. it would appear that in this case it worked, so well done to the teams aboard!
Unfortunately, there are too many crash sites in history where an attempt to 'stretch the glide' had insufficient energy (potential or kinetic) for it to work and the result was a wreck.