According to Osho, to treat a Buddha is not to perform rituals or protocols but to recognize and mirror his emptiness—"beating the drum." Kasan’s drumbeat declares that everything, including Buddha, is empty; the only difference is Buddha knows it while you still believe you are someone. So meeting the enlightened one means dropping intellect and control, hearing the wordless teaching, and resting in the same spaciousness.
It means there’s no special courtesy—be simple and silent, like an empty drum, and notice that nothing (not even you or Buddha) is solid.