I think the reason for that might be that this fight had an almost cinematic quality to it.
You had the first act (first two rounds) where we had fighters feeling themselves out, not much of an action, let's call it a development of a character.
You had act two (round three and four) where the conflict escalates and the protagonist (Lawler in that case) faces multiple obstacles on the way to his goal (Rory's headkicks in that matter).
You had probably the best MMA interlude I've ever seen in my life, meaning the legendary staredown before round five, calm before the storm.
Then finally, you have the final act where the protagonist puts everything on the line and literally goes for the kill, overcoming every and each obstacle standing in his way.
TL;DR: This fight has so many legendary moments to it, it would be almost unfair to pin it down with just a comeback statement.