When Dean saw that golden pillar of light going towards the skies, his heart throbbed and he lost strength on his legs for a moment.
'How long did I pass unconscious? How long was this fight? Did I lose track on time or something?' Dean thought, trying to sort out where he was mistaken.
'I can't let them win! I can't let things like they are now! That was my final chance to do things in the right way!'
Dean's body began to absorb "Chaos" again but in a more wild way this time.
'I don't care whether I go out of control or not. I need more power. I need to shake off this fatigue and cure these wounds. I can't win if I don't act right now!'
Dean knew exactly what was that pillar of energy there. He heard about it during his time with Nero. The latter taught him about the Last Wish and a lot of different things about that world. During that month that Dean spent with him, Nero acted like a teacher, a mentor.