Giantbane Tactical Feat and Sneat Attack

[Tellerve]

In regards to the 3rd special ability of the tactical feat Giantbane where you climb up onto the larger creature, I was wondering how flanking was determined.

Normally you work on flat planes (tabletop) and so I was wondering how this would work if you were on top/side of a creature. Would a diagonal line be drawn for flanking? What if you weren't on the creature but instead floating/flying 5' or more up. Anyone had/have thoughts on this?

And somewhat in regards to this, I haven't read anywhere that you can't have two tactical feat manuvers going on at the same time. Say for instance the Elusive Target's negate power attack and Giantbane's Duck underneath. Thoughts? I know I have mine

Tellerve

 

[Legildur]

No flanking, as you can't be 'on the opposite border or opposite corner' from a friendly creature. You are simply in the same space.

If you qualify for both tactical feats, then I don't see why they can't both apply.