"Critical Defenses" spell not refreshing?

I am fairly new to the game, and wonder if I am just missing something, but the assassin spell "critical defenses" does not seem to be refreshing as it should when my character lands critical hits. Official spell description:

Critical Defenses - Enchantment Spell
Energy: 10
Activation: 1 Duration: 6
Recharge: 30
Enchantment Spell. For 6 seconds, you have a 25..75% chance to "block." Critical Defenses refreshes every time you land a critical hit.

What I have noticed (with Assassin/Warrior, over his progression from lvl 16 to 20) is that the skill never seems to recharge early with a critical hit. I *think* my character is landing critical hits at least sometimes (tested with critical hit attribute set to 12, with critical eye equipped, and even using "Wild blow" warrior skill to ensure that he actually landed a critical hit). But, the spell always seems to take the full 30 second recharge time no matter what.

I just wondered if this is now working right or I am missing something? Thanks in advance for enlightenment :P

If I'm not mistaken the 'refreshes' means that the 6 second timer for the duration of the skill resets every time you do a critical. The recharge rate of the skill doesn't change.

pk is right the enchant itself lasts another 6 seconds each time you land a critical hit

Thanks for the quick clarification, can't wait to get back in and try again