So here is my issue with it.
If you have dexterity mastery active, you will notice the mastery will trigger 2 EMP modification charges:
a) once when you GAIN the cruelty buff from the mastery,
b) when you CONSUME the cruelty buff once you hit the opponent.
Come on, the node says so.
So, the verdict? Coding error? Bug? Bug on the mastery?