Rita, while singing, would be acutely aware of her opponent, to the point in which she noticed the swift de-summoning of the scorpion and the subsequent disappearance of their foe via a famaliar technique.
She would stop singing at this moment, understanding the futility in continuing to do so. Somehow, someway, her opponent had managed to avoid this attack. Either they had skill in Ototon, had sound regulating earbuds akin to Eric's, or simply had a mechanism to avoid hearing her. Even if temporary, that meant that her opponent could not actually hear what was going on in the battlefield. No doubt though that they could see, and as Rita observed via sensory, her opponent had vanished using the chameleon techinque.
Two could play that game. But as she returned to her fours, she noticed Eric had migrated underneath her, dodging the flames with what she believed to be the most obvious of his moves she had seen this fight.
"Failure. Somehow, our quarry managed to avoid succumbing to my melody. This means that, more likely than not, sound genjutsu is not going to work against him. Additionally, he is under the influence of the camouflage technique; his skill in it is noteable, to the point in which he seems to have erased his very presence. What shall our next course of action be, for we can only detect him when he disturbs the environment sufficiently enough, or if he reveals himself voluntarily?"
Terrible news indeed to hear, for Eric had hoped that his opponent would have been ensared in that attack. Rita was not styled for brute force like Pyro was; if they could not sing their quarry to sleep, and their quarry had resorted to using the chameleon technique against a visually inferior opponent, then that suggested that they too was at an impasse.
This fight had dragged on far longer than he had anticipated. His efforts at ending it had so far failed; his opponent was too defensive, and he was too offensive. He did not need to decisively defeat his opponent at this stage. Besides, if he needed to, he could wait until sunset, when the shadows would be longer, and he would be at a much greater tactical advantage on the shadow side of the tower.
"If our foe wants to play hide-and-go-seek, then let him be it. Rita, attack the building's base and disturb the shadows there when he shows himself. Go stealth in the meantime."
Eric seemed to once again be absorbed into a shadow, Rita's in particular. This time, however, rather than appearing someplace on the battlefield, he would merely enter his pocket dimension without his Blade of Shadows (leaving it behind for reasons similar to why he left it behind last time), content to be patient. His trench blade knives would have embedded themselves on the first floor of the tower, and since he could control their shadows much like he could control his own, they would serve as a secondary waypoint of sorts.
It was very rare that Rita got to use her stealth; however, since their quarry seemed so determined to drag this out, Rita would nod in compliance. As awkward as it was to speak to Eric with him still underneath her belly, it still did not remove the humor in that he was going to attempt to wait out his opponent. This strategy was not a popular one in the arsenal, but it seemed the only option for now. Her scales would rapidly seemed to change coloration, Rita utilizing the camouflage technique to practically disappear, seemingly removing her presence from the battlefield.
Chameleon Jutsu; Meisaigakure no Jutsu
Once invisible and very difficult to detect, Rita would take off into the air, ascending higher and higher as to gain altitude. The flapping of her wings and the dust from initial take-off would be the only signs that she had moved, and though her quarry could most likely hear her wingflaps, it would be hard to strike at her, especially with any chakra-based attacks.