Then something began to hurt Mowgli inside him, as he had never been hurt in his life before, and he caught his breath and sobbed, and the tears ran down his face. “What is it? What is it?" he said. "I do not wish to leave the jungle, and I do not know what this is. Am I dying, Bagheera?"

"No, Little Brother. Those are only tears such as men use," said Bagheera. "Now I know thou art a man, and a man's cub no longer. The jungle is shut indeed to thee henceforward. Let them fall, Mowgli; they are only tears." So Mowgli sat and cried as though his heart would break; and he had never cried in all his life before.

—“Mowgli’s Brothers,” The Jungle Book,
Rudyard Kipling

Why is Mowgli's response unusual?

What does the response indicate to Bagheera?