My friend showed me some videos of combat ki on youtube, and my initial reaction was being very impressed. Then it got replaced by skepticism, so i asked my college sensei/coach about it yesterday, and he had a bit of a negative reaction, basically thinking that it's almost all showmanship stuff, and not actually usable in any sort of fight. Figured i'd ask here and see what everyone else thought of it. Is it legit, or just trickery? and if it is legit, is it actually useful in real fights?