The narrator says to her that their hearts hammer because the narrator is scared and frightened and does not know what to do. He is close to a leopard and is scared.
The heart hammer is a mythical warrior weapon in treasure quests. which is used to save our lives against the giants. As the narrator saw the leopard near him, he was scared and ran away.
He wanted to go back to his home, but Mada Jan would be angry. This shows that the narrator is stuck in the conflict.
Therefore, the narrator is scared and frightened.
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