Thread:Sunou-san/@comment-25787298-20151021172708/@comment-26689808-20151025154044

^It was Shinohara who fought Demon Yamada. Iwao fought the Bikaku Wobbegong.

And from what we saw in the flashback, it looks like Shinohara did fight Demon Yamada 1 on 1, which probably helped him get his nickname "Invulnerable Shinohara".