Inside a rather cramped indoor training ground at the Jashin Cult.
Black Zetsu lay in a chair, exhausted in body and mind, curled into a puddle of pitch-black sludge.
He stared blankly at the Cave's ceiling, his eyes vacant.
Leaf Dragon stood beside a blackboard, expressionlessly covering it with densely packed Sealing Jutsu formulas, then pointing to each one as he explained.
"First, you should do this, then this, and finally this... Did you understand?"
The red-haired child looked as though he were in a dream. He shook his head instinctively, then tears welled in his eyes.
Knowledge flowed in one ear and out the other, leaving not a trace in his brain. It felt as though the knowledge had washed over him, leaving him utterly dazed.
Yin listened patiently for a while, then pursed his lips and pattered back across the room.
He looked at Black Zetsu, who had melted into a puddle, and threw himself straight into him with tears in his eyes.
"I don't understand, Dad! I'm an idiot... Waaah..."
He began his daily bout of whimpering and crying, sniffling and sobbing as though he had suffered a terrible injustice.
Black Zetsu let out a long sigh, expertly picked up the tear-streaked child, and patted his back.
"Leaf Dragon, can't you explain it more simply... Sigh, forget it. Let's put Sealing Jutsu aside for now. We'll come back to it later..."
Black Zetsu glanced at Leaf Dragon, who had made a rare mess of things, then resigned himself and gave up struggling.
Black Zetsu had no idea what learning pace was normal for a child this age, so he had put Leaf Dragon entirely in charge of Yin's education.
But less than an hour after he sent the child over, Yin had come running back on the