Because it was such a great fight that kept getting better as the fight went on. It was a slug-fest but a skillful one at close quarters with subtle positioning, traps, terrific combination punching. Round 8 was amazing enough as it was, then 2 rounds later we had round 10, with maybe the greatest single round comeback since Shavers-Williams (or even better).
The 10th round of corrales castillo did it for me. Seeing chico come back like that after it looked like he was done was amazing.