Ryu stayed there for a while. It was definitely one person, he could tell that. Although they had put quite some effort into making it seem like it was more than one, what they couldn't change was the essence of their attack, its very core. However, it seemed that they knew that some sharper individuals might be able to tell this, and had, as a result, morphed and changed what their aura was. Ryu didn't recognize it and he didn't feel like taking the time it would take to decipher it all.
It was true that he could, but why? These people had nothing to do with him, and whether this person would be a threat to him in the future… so what?