Maybe he was hoping to bleed to death on the way down .
Maybe there is a rational explanation, perhaps he had an accident while slicing veggies naked and realizing what he'd done threw himself out the window .
Probably not.
I remember reading somewhere that the "Wu Tang" was the oldest surviving example of the samurai style sword, the design being brought to Japan by the early Buddhist monks, I can't find a link confirming that though so I'm not sure of the accuracy .