Why the khoisan loose livestock during 1652​

The Khoikhoi moved from place-to-place seasonally and didn't stay in the same area more than a few weeks on end. The main reason behind this was to ensure that their animals had sufficient grazing. ... Like the San, the Khoikhoi wore leather clothes, which assisted in protecting their feet and like, during their travels

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.