Is splitting your skill tree possible?

Basically, I'm in work and can't try it out for myself so thought I'd ask. If you advance a number of nodes in the passive tree, is it possible to use a respec point on ANY of those previously selected nodes or only ones that are at the end of a path?

E.G.
1->2->3->4..... can node 2 or 3 be removed with a respec point?

Only if there is an alternative path already in place to 4. You cant orphan nodes.

all nodes have to be connected in some way, making one big, weird, not-so-straight line back to your starting zone
so for your example, no

Can't cheat the system with resets.

Awesome. Thanks for the replies! I assumed as much. It seemed like a ridiculous possibility anyway :D