I've noted something going off and I can't figure out what it is or how I can activate it if it's something that can be activated.

A zombie claws at you!

With no room to spare, you manage to parry the blow with your grey golvern katana!

You tense with anticipation, spying an opportunity to counterattack!

R>

I've not seen it under feats, weapons or cmans and I've had no luck on the wiki looking for Counterattack or Counter Attack. Anyone care to enlightening me?

Thanks Doug, that looks like what it might be. :)