The fifth tier glaive ability Riposte (Character Options, p. 9) has the cost of 6 Speed points, and is an enabler. Following a successful defence roll, it allows either an immediate counter-attack, or a delayed asset to a subsequent attack.
The Corebook makes it clear that enablers are not actions in themselves, but either function constantly, or are parts of other actions (p 25), and Riposte is clearly the latter type.
But my question is - which action does Riposte apply to: the defence action which has just happened, or the (counter-)attack which is about to happen? This makes a difference in terms of using Edge and Effort for the defence or attack actions.