|Don't forget that Haru had a lot of bad wounds and he still managed to beat him.|
That is true. Haru is the one who finished Doryu off, and Haru gave Doryu his first and only defeat.
Also I think I know what you meant about him not being himself. I think Haru activated the ninth form of the ten powers sword, the Scarificer. Don't tell me if I am right or wrong.