steely tenacity

Ok, what happpens when steely is unblocked is pretty clear to me, but what happens when it is blocked? Do you get to replace it? And can you put it back in your hand later? Or is that part of the action and hence doesnt work?
thx!
W

Name: Steely Tenacity
Cardtype: Action/Combat
Cost: 1 blood
Discipline: Animalism/Dominate/Quietus
Requires an anarch. Do not replace until after this action. When you would replace this card, you may take this card from your ash heap instead.
[ani] [COMBAT] Strike: hand strike or use a melee weapon strike. This strike is at +1 damage, with an optional press.
[dom] [ACTION] Bleed at +1 bleed.
[qui] [ACTION] +1 stealth action. Enter combat with a ready minion.

Blocked or unblocked (for the action effects) has no difference on the draw effect. The card is in the ash heap regardless and may be retrieve from there.