heh, I think it's for the same reason that Kenshin yells his attacks.'Cause it's a samurai-y thing to do, announce your attack partially as a matter of pride for you school, because no two ninjas or samurais are alike, and peope create their own jutsus and swors styles. It's like giving credit to the creator, or if you yourself created it, it's pride. - My friend Himeko's opnion. Beats the crap out of mine....