Ninjutsu is a martial art and, whilst it can be applied to self defence, is not limited to that and usually takes more training to be useful in physical situations. I have trained, for example, Marc Moor in the Bujinkan and he can handle himself for real :-) 

I am sceptical and unless you can get a technique to work on me without me letting you I find it unrealistic. I have asked him to put me in holds etc. that he has demonstrated so I can see if they work. He can and has sent me to the ground screaming in pain unable to resist.

Steve Taylor