Krav Maga in Children's Magical Fantasy Novel

I have written a children's book called The Catastrophe of the Emerald Queen which is magical fantasy for readers aged 10+.

The novel has major anti-bullying themes and I'm currently working on the sequel called The Sunder of the Octagon. 

With the permission of Expert 3 Krav Maga Global instructor Jacek Walczak I've based one character's physical appearance on him (simple reason, Jacek looks scary). I did the Bus't Up seminar with Jacek last year.

The guy in the novel is called Alaskadie, an elite warrior of a hidden order called the Octagon Sentinels. In this scene he's being threatened by a baddy while minding his own business in a tavern. Reason he looks bored is he knows that the other man (and the 4 other guys just off page that are with him) are absolutely no threat and he can take them all down without effort.

Once the book is out, Jacek gets a free, signed copy.