Gentlemen,
Witch Hunter was not meant to be an exhaustive rule set, like D&D 3.x tried to be.
These rules weren't written to cover every extant circumstance that could come up, but the general ones.
For issues like the one you bring up, it would be up to the Grand Master, as it should be, to adjudicate the matter.
So if I were the GM and you said you were doing 1 and 2, I would say that you can follow the Bad Guy, but I'd say you could only move half as fast as you are weaving in and out, attempting to avoid attacks.
As for #2, I'd say no. One cannot cast a spell (as a general rul) and protect oneself from attack as well.
GMing - it's an art, not a science.