Ryu hadn't even used any strength against that giant. He had found the battle to be nothing more than a joke.
But it also awakened another thought in him.
Sometimes, the environment was just as important to a battle as the power and skills of the individuals. In the battle just now, it was more important than any other single factor.
This was something that he had always vaguely known, but it hadn't truly set in until just now.
He had used no abilities but his close combat against the giant. He had somewhat refined it to be in tune with this environment, but he wasn't satisfied yet. The fact that the giant was overwhelmed could only mean that he was too pathetic.
However, it was because the giant couldn't move with as much fluidity as it was used to that Ryu had been able to flicker around it like that even without his Spacetime Soul Nature.