Harry nodded grimly. "It’s probably where he perfected the spell before creating his last Horcrux. Which is why I don’t want to kill any of the kids. They ... and you ... have been drawn into a sort of collective with Riddle, sort of like a hive around his lifeforce. Essentially, you are one ... and I don’t know what separation will do to you. So until I know more, I won’t risk it. But by studying as many of his offspring as we can, we give ourselves the best chance of solving this safely."