PURPORT

One may ask how Krsna's pastimes could be interrupted by a demon. Srila Visvanatha Cakravarti Thakura answers this question by saying that although the transcendental pleasure being enjoyed by the cowherd boys could not be stopped, unless they stopped the transcendental pleasure of their various activities they could not eat their lunch. Therefore at lunchtime Aghasura appeared by the arrangement of yogamaya, so that for the time being they could stop their activities and take lunch. Changing varieties are the mother of enjoyment. The cowherd boys would continuously play, then stop, and then again enjoy in a different way. Therefore every day a demon would come and interrupt their sporting pastimes. The demon would be killed, and then the boys would engage again in their transcendental pastimes.