Hiro seemed to be on the losing side.
With Misha's Belladonna Dance, she managed to slowly decrease Hiro's strength and speed. However, while Hiro was indeed getting weaker, it was only to the extent that Hiro was on equal footing with Misha. It was not like he had become so weak that he could not react to Misha's speed.
He can still manage to defend himself. It would have been a different story if Misha's rank had been higher.
-CLANG! -CLANG! -CLANK!
Misha continued using Belladonna Dance to corner Hiro. However, both of them knew Misha was the one at a disadvantage. She was consuming a huge amount of mana to continuously use Belladonna dance.
On the other hand, Hiro still has more than half his mana. While his body was not in great condition, his mana level was fully recovered. His mana capacity was already higher than Misha's and with Misha continuously burning her mana, Misha would be the first one to empty her fuel. This would naturally mean that Hiro would win.