User blog comment:Godisme/Rag Lag Rumble/@comment-1624279-20111020221835/@comment-1268838-20111023022744

I find it funny that MS chose the whole "NDR" thing. The term "Hurtless Area" is written on the raw scan, so it seems pretty apparent that that is the proper translation, or interpretation.

Also, Aeron's interpretation may be correct. Reading another translation, Tsukishima says that "Senbonzakura possesses a range where the blade doesn't cut," which would seem to suggest that they can only exist in that radius for defensive purposes.