Whatever this activity was, Spock was extremely wary of its usefulness.

"Is this a human tradition?"

It wasn't that he was stalling. Spock hadn't actually decided whether or not he would partake in the activity, given Devi's enthusiasm in teaching him. However, every part of the instructions she described baffled him. How did these rules come about? What preponderance did one need to be in to invent this set of instructions? Did humans find enjoyment in rock throwing, jumping and collecting rocks again?