Kreacher hurriedly stepped in front of Regulus. Using a Transfiguration Charm, he raised four stone walls around him, temporarily trapping his young master inside. Watching Regulus roll about in agony within the stone walls, covered in mud and tearing at his robes, his eyes instantly reddened.
"Master Regulus! Hold on a little longer! Kreacher has a way... Kreacher will be right back!"
Kreacher vanished with a crack. When he reappeared, he was carrying an Undetectable Extension Bag. He knelt before his young master, turned the nearly unconscious Regulus over, and rested his head in his lap.
Then he pulled out a water barrel as tall as a person from the Undetectable Extension Bag, attached a hose to it, and fed water into Regulus's mouth.
"Waaah... It's all because Kreacher is useless! Kreacher deserves to die! Why didn't Kreacher knock Master out and drink that cursed potion himself? Master Regulus has always been so kind to Kreacher!"
Madara watched helplessly as Kreacher fed him water while smashing his own forehead with stones made through Transfiguration.
"Cough, cough... Kreacher... stop. Don't cry. I knew all about what the Dark Lord did to you back then. I'm atoning for my sins now, so please don't mourn for me..."
Regulus woke up. He reached out and gently stroked Kreacher's head, his voice soft.
"Waaah... Master Regulus, Kreacher will take you home right now! Lady Walburga will surely find a way to save you!"
He desperately clutched Regulus's hand, tears streaming down his face as he watched his complexion grow increasingly pale.
"Waaah... Master Regulus... Kreacher will take you home right now! Lady Walburga will surely find a way to save you!"
Kreacher desperately held on to Regulus's hand, tears striking the stone with faint, broken sounds. Madara could see the changes in Regulus—his vitality