Can you explain the philosophical concept of the 'triad' vanishing as described in the text?

Chapter 35 describes a state of deep spiritual absorption in Sai where the sense of duality dissolves. This is illustrated through the concept of a 'triad' vanishing. For each of the senses, there is a triad: for sight, it is the seer, the seen, and the act of seeing; for hearing, it is the hearer, the heard, and the act of hearing. In the state of ultimate devotion described, this triad shatters. The devotee becomes so engrossed in Sai that the distinction between their self (the seer/hearer) and the object of their devotion (Sai) disappears. All that remains is the experience of Sai, leading to a state of non-duality and ultimately, Naishkarmya or non-action.