Janis my apologies if I've made it look overly complicated. It's a little difficult to explain. Dan's extra comments are helpful I think.
To put it in a nutshell - when you adjust the Col Temp slider in a WB adjustment, you are not changing the Col Temp of the illuminant, you are changing the WB correction factor corresponding to an assumed Col Temp of the illuminant. If you bring the slider down below the optimum WB setting you will be under-correcting for the warmth of the actual illuminant and it will look blueish. And vice versa.
Nice image by the way!
Dave