"Some very much do," Koumyou confirms, knowing he's among them. "The infection just won't go away for some of us. We drain the pressure inside the wound, but eventually it just builds back up again. Someday, it finally heals, but it still leaves a scar that aches."

The returning pressure might very well happen to Buttercup, here. Best she know what it is if the grief starts to choke her again in the future, and not just think it's some kind of flaw.