For me to be upset would imply some moral judgement on my part. You know me better than that. After all, I did not question your motives when you came to me Master Kirigi
Master Kirigi is an amoral Ninjitsu Sensei who occasionally aids in the training of elite members of Ras Al Ghuls League of Assassins (although he is not a member himself). He taught young Bruce Wayne a devastating martial arts manoeuvre known as the vibrating palm strike, a move that kills instantly if used correctly (of course, Batman never uses it to kill). The character first appeared in Batman Issue 431 (March, 1989), in the James Owsley/Jim Aparo story The Wall. The story is notable because it features Bruce Wayne still grieving over the death of Jason Todd and an absolutely beautiful multi-page fight sequence between Batman and a gang of ninjas. Kirigi has since appeared a couple more times, but never in a major storyline. However, we could still see him show up at some point in the future. After all, you never know when you might need a vibrating palm strike...