I dunno abt the details...the pic is suppose to be from R34 manual...it's showing HICAS correction at slow med and high speed...
but if you ask me what exactly happened during cornering I can't really tell....I think the car will try to prevent your wheels from loosing traction so 1st thing the TCS will cause fuel cut.
If radius of turn is wide enough, the TCS will not activate (I'm not sure how TCS works either but I notice if my radius of turning is wide, TCS does not kick in)..
in this case now the HICAS will try to prevent understeer, also for more traction, the rear wheel will turn in the same direction as the corner you taking (see picture, high speed)...let's say fast corner to right, front wheel to right, rear wheel to right slightly....as you countersteer (steering wheel turn to left), the front wheel to left..but the rear still to the right because of HICAS....I would imagine this will create a rotating motion making the car want to spin 360 degrees anticlockwise( massive oversteer)....
so the tail of the car is now swinging in anticlockwise direction dangerously....and as you notice the tail of the car start spinning too much you slam the steering wheel back to the right...and there you go big messy snakey...that or you spin out....
I'm not sure about what I said...jsut my impretation of what might happened...I think what I said is rubbish ..lol ...but I havem't been able to find a proper explanation yet... ><