What does Chapter 50 say about the concept of 'Avagraha' in the Bhagavad Gita?

Chapter 50 discusses a specific verse from the fourth chapter of the Bhagavad Gita, "Tadviddhi pranipatena pariprasnena sevaya | upadeksyanti te jnanam jnaninastattvadarsinah ||". It points out a subtle interpretation where an 'Avagraha' (a grammatical mark in Sanskrit) appearing before the word 'Jnana' (knowledge) in the third line can be seen as an indicator of 'Ajnana' (ignorance). While the standard meaning of the verse is about gaining knowledge, this chapter suggests a discourse oriented toward ignorance. This interpretation allows for a deeper exploration of how ignorance must first be understood and removed before true knowledge can dawn.