Plane Sailing
Astral Admin - Mwahahaha!
Also, riposte strike's "counter-attack" is not a condition, so enemies don't know about it. Melee'ing monsters won't know to back away to avoid the "counter-attack": the mage was just lucky.
I disagree that enemies automatically don't know about it because it isn't imposing a condition. There is every reason to describe someone using riposte strike as poised to make a riposte should you attack him, and to respond appropriately.
The game almost assumes that everyone knows what everything does on both side of the screen.