Regulus' mind was swirling with the information given, just little bits and pieces that meant maybe he had managed to make Voldemort mortal, but he'd need a lot more than that, because he didn't want to die in vain.
"It's a war, Sirius. No one wins." It was something that he had started to see long before the Dark Lord had used Kreacher for his own purposes. "You'd think people would realize that considering how many people have died, how many families have been destroyed, but of course, common sense is rarely common."
He took a deep breath. "This can all wait. The past won't really matter unless we can get back to it, and right now, it looks like Hogwarts is the only thing that knows how we got here and how we go back. If the castle has gone to the trouble of getting us here, I doubt it'll send us back. Maybe we should go and see who else is around. After all, if it wants to repopulate the world, I doubt two brothers and a brother's best friend is the way to go."