> no one on this thread has addressed the question of why a >crewmember advanced the throttles by a significant amount >late (around V1) in the takeoff roll, instead of calling an abort.
You are a thousand or 800 feet from the end of the runway in a 747 at very high speed thinking you are near your rotation speed. If you reject the plane will almost certainly be destroyed and you have a high chance of dying. If you rotate now and add power(this has happened before successfully to avoid a collision) you may very well make it with little or no damage. Your time frame to decide was equivelant to reading the first few words on this post. I think you will find that many posters here would have done the same. Maybe myself included. The aviation industry teaches us to be go -oriented at high speed.