Seeing all his kinsmen arrayed on both sides, the son of Kunti was filled with overwhelming compassion. Grief rising in his voice, he spoke. This is the moment the chapter's title — Arjuna Vishada Yoga, the Yoga of Arjuna's Grief — becomes real.
The text says "kripaya paraya avishtah" — filled to the brim with deep compassion. What floods Arjuna is not fear and not cowardice. It is kripaa — tender, heartfelt compassion. Like a mother seeing her children turn on each other and feeling her heart break, Arjuna looks at his own people standing as enemies and something inside him gives way.
From this point forward, Arjuna will pour out his anguish — his physical collapse, his moral doubt, his refusal to fight. It is this grief, raw and honest, that will open the door for Krishna's teaching in the chapters ahead.