It's a bit boggling, as the whole story has been recently. Maybe Inui knows a magic plant that will heal their skin. But at least we're seeing some Fudomine at last.

Kuranosuke threatens Kintarou with the Poison Hand if he doesn't behave. If it touches you, you'll die. For some reason, Kintarou believes it so they use it to keep him under control.

Or so I was told. :)