Rorschach saw them as well, the inkblots shifting once again. He moved into a shadowy section of the roof. "Be ready," was all he said to Rei. His hand was in his coat, clearly gripping the grappling gun. If these two idiots made any kind of moves, he would be prepared to take care of the situation.
Now, if two drunkards decided they were going to fight each other, Rorschach didn't give too much of a damn, as long as the fight stayed nonlethal. Two friends fighting while drunk wasn't exactly rare. If the fight got bad, or someone pulled a weapon, he would intervene. Not until then. He was less concerned with idiocy than he was actual crime.