Yup, I can understand that. Because my Ti function is high to begin with. When I am in a shadow mode, my Ti (and some Te) becomes VERY strong. And in combo with using Se alot, it makes me highly insensitive people and just not caring about anyone. In other words I get like "me me me me me". Since our shadow is ESTP, I become all about instant gratification, and don't even realise I am like that until I come out of shadow. And when I do, I am so so drained of all energy.
Thankfully, it takes ALOT of pressure and such to make me go fully shadow. Last year I had about a month to two month period where I was very shadow due to alot of stress, it was bad.