Most likely an ego/power trip. His mind has been made up, he's ticked that his decision has been fought so hard, and he probably feels he would lose face by weakening his stand in any way.
Sure, good judges can make difficult and unpopular decisions, and sometimes the laws are framed in such a way as to leave them no choice but to act against their desires. But the magnitude and aspect of basic humanity in this case and the judges actions so far leave me incredibly cynical about his character and perhaps motives. Solomon ruled that the baby should be cut in half on the calculation that the real mother would reveal herself in reaction. This judge has seen and heard the real natures of the participants revealed, yet still continues to insist on cutting that baby in half, because that is what he originally ruled. Thus the difference between a wise man and a Pharasee.
I don't give a flying hoot about his feelings .. I care about justice and yes, I agree that sometimes tough decisions are made .. but this doesn't have to be one of them ...
Sorry if I am sounding snotting towards you .. I don't mean to be .. I am angry at this Judge