She and Ron are running to catch Nagini, Hermione distracting it while Ron tries to attack it and stab it with the fang... But the snake turns away from Hermione, turning to Ron, its fangs out, and it bites him once, twice, thrice while Hermione tries to curse it, but of course, to no avail... She runs to Ron, but he is bleeding furiously, there’s nothing she can do to save him, she only cries, holding his viciously jolting dying body close...