“If a modified robot were to drop a heavy weight upon a
human being, he would not be breaking the First Law, if he did so with the knowledge
that his strength and reaction speed would be sufficient to snatch the weight away before
it struck the man. However once the weight left his fingers, he would be no longer the
active medium. Only the blind force of gravity would be that. The robot could then
change his mind and merely by inaction, allow the weight to strike. The modified First
Law allows that” (79).”