Primordial Chaos missed the opportunity to stop Rowan from reaching the seventh-dimensional level with a single well-placed strike.
Rowan's ability to detect the Primordial and strike at the perfect moment was not a fluke. In the short moments he had fought Bahamut and observed the movements of Primordial beings, his talent as an unprecedented warrior whose comprehension was unmatched had begun to rapidly decipher the patterns in the flow of battle.
Higher-dimensional beings treated space and time as mere backdrops to their glory, and their movements exceeded the concept of speed and direction. Fighting them required a potent understanding of wielding the higher-dimensional perceptions beyond all known limits.
He had not yet perfected this process; it would take him a long time and multiple battles to achieve such a thing, but Rowan was already on the path, and Primordial Chaos was the first of many to taste his blade.