1) In Defiance
2) Healer casts Protect on you
3) Use Thrill of Battle (maybe even toss in a Vit potion! ;-) )
4) Stone Skin lands before ToB wears off
5) Foresite to further reduce incoming damage at this point.

Here's the question:
It seems that by going purely on tooltips, 18% of a greatly (temporarily) inflated HP pool is a LOT.

Does the SS effect get re-calculated when ToB vanishes, or is it "Locked In" based on the current stats when it lands?

If it's locked in, that's a lot more damage mitigation possible, and may justify team-co-ordination timed macros<se.#> like we used to do with Magic Burst.

ie:
/p "Begin casting SS on War now!" <se.1>
/wait # (however long to allow for notify to begin casting stoneskin)
/ac "Thrill of Battle" <me>
/wait 2.5
/ac "Foresite"

Whatcha think?