Re: Rolling with a sword?
Many of the koryu include ukemi in their practice. Nothing new about learning to fall ... some say that 'modern' theory of ukemi came from Sekiuchi Ryu jujutsu, BTW.
Taking ukemi with weapons is, like learning to fall in the first place, a learned and trained skill.
You _can_ roll with a sword in the obi, but it's not necessarily the same thing as rolling unencumbered. More likely, the fall will be more breakfall than roll ...