Why did Mavshibai's service to Baba appear strange or pitiable to Damu Anna?

Damu Anna found Mavshibai's method of service unusual due to its sheer physical intensity. Chapter 24 describes her as twisting and 'grinding' Baba's stomach with both hands, pressing and churning 'like a pot of buttermilk.' This extraordinary way of pressing made Baba's stomach and back appear flat, and she moved up and down with him in a 'strange kind' of service. While the text clarifies this was an act of pure love and devotion, to an observer like Anna, the physical jolts and her fearless absorption produced a sense of pity. He saw the vigorous, almost violent-looking action without immediately perceiving the deep, guileless love that motivated it.