Theory:

     As he walked, the night deepened. The moon was bright and the stars shone clearly in the Rajasthan sky. Still a few miles short of his destination, Vijay Singh remembered the old woman’s packet. He opened it and found nothing but a lump of salt and an egg. The old woman was well-known for her eccentricities.
 
     As Vijay Singh stepped into the Haunted Desert, he heard a voice. “Vijay Singh, Vijay Singh! You will get lost in the desert. Come this way. I am your friend, Natwar.” At once Vijay Singh realised it was not his friend but a ghost. Trying to sound brave, he called back, “Where are you, my dear Natwar? It’s dark and I cannot see you. Come here and show me the way.” Like all good wrestlers, Vijay Singh wanted to size up his enemy.
Explanation:
 
Hours went by. The night became very deep. The moon was bright, and the stars shone clearly in the Rajasthan sky. When Vijay Singh was about to reach the isolated desert, he was reminded of the old woman’s packet. He was curious to know about the thing inside. Vijay Singh opened it and found nothing but a lump of salt and an egg. The old woman is known for her strange, abnormal behaviour in her village.

Vijay Singh, at last, reached the Haunted Desert. As Vijay Singh stepped into the Haunted Desert, he heard a voice. The voice called his name, "Vijay Singh, Vijay Singh!"; It told him that he would get lost in the desert and instructed to come on its way. The voice also introduced him as his friend 'Natwar'.
 
On hearing the voice, Vijay Singh concluded that it was not his friend but a ghost. Though he realized it was the ghost's voice, he was not scared. He called back the ghost in his brave voice as, “Where are you, my dear Natwar? It’s dark and I cannot see you. Come here and show me the way.” As a wrestler, he wanted to see the size and check the capacity of his enemy.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Isolated/Deserted
Alone or not connected from people or things
2.
Curious
Eager to learn or know something
3.
Destination
The place chosen as an end
Reference:
National Council of Educational Research and Training (2006). A Strange Wrestling Match: Indira David (pp. 43-51). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.