By getting beaten up by the frog, Theo learned three big lessons. First, he needed to improve his swimming skill. Second, the way to ignore the water resistance would be the first thing to be figured out. Third, it was pretty hard to manipulate the water, especially when he was quite deep due to the pressure fighting back his Control.
Now that he had completed his objective to learn about underwater fights, Theo planned to bring the frog to the surface.
"Gah!" Theo's transformation was undone again after he crashed into the wall.
Before the frog reached him, Theo used his Metamorphosis again to turn back to his fish form. However, only his right hand transformed into a pectoral fin. The rest of the body remained in the human form.
Seeing Theo's failure, the frog's expression brightened as he laughed. "Hahaha. You can't transform again. It's time to drown you!"
