There was nothing left for him to do but the one option forced upon him.
Tagawa was found out by the female who noticed his nature and since this was a village filled predominantly by humans, he couldn't deny it once it was revealed.
He only had a few moments to decide what he'd do and every second that passed only worked against him, especially if he considered his cover being blown.
His very body released an ever growing wave of mud that spread outwards into the village itself, claiming Haruna as its first victim before engulfing various other swordsmen in the village and blockading the various schools in the distance with the large quantity of mud and ensuring that he could go into the Temple of Unified Blades without any problems.