"More than likely," Harry nodded, bitterly. "It helps Dumbledore against me, too, as not only is your own immense power flowing into him, there's also a trace of your essence there, too. My magic can detect that and is resisting going to my full potency in case it damages you. It's a bit like brother wands going up against each other ... our magics dont want to fight, so they repel each other like opposing magnets."