A bit late to this, but I like Sotc's suggestion about offensive capabilities increasing as you get worn down.

I would also be interested in seeing a skill that uses shields more offensively, which in my opinion would really distinguish the war. Maybe something where it decreases your opponents initiative or defence and each shield could have a different aspect (buckler can do a shield stun, large shield can pin your opponent and increase critical chances, or something like that). This video below shows how the shield can actually be the weapon and how you use your sword to exploit the advantage...

https://m.youtube.com/watch?v=dkhpqAGdZPc

I'm okay with Down and Dangerous though if Nate feels it's right