What incident does the author remember when he reached the small town of Hor?

Dear Student,

They had suffered two punctures in quick succession on the drive from the salt lake. Tsetan was eager to have them fixed as they left him with no spares. So they stopped outside a tyre-repair shop. Daniel was returning to Lhasa. He found a ride in a truck. So the author and Tsetan bade Daniel farewell at the tyre-repair shop.

Regards