Crush Chance recreates your combat table and updates whenever your auras or equipment change. This combat table recreation can be seen in the FuBar tooltip. The combat table accurately accounts for effects of the level difference between you and the mob level. If you set the mob level to zero it uses the level of the last target you had. Crush Chance also detects if you have a shield equipped or not and shows a block chance of zero if not. The addon will update whenever your auras or equipment change, and also if you gain defense skill. Crush Chance will accurately account for the bonus defense from Warrior and Paladin talents as well as resilience gear.