WOWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
(By the way, if anyone is looking for legit, historically accurate Ninja on film, check out the Shinobi no Mono series; the first four are available on Amazon as a box set—last I checked.)
And of all the samples you could have used, you picked a real gem: it WAS indeed an ancient Chinese skill, before being exported to Japan.
Much respect on this king!
*posts to FB and adds to YouTube favorites*