I just rolled the random mutation "Sonar" and one ability is to "stun": Stun enemies at up to Short range. A number of victims equal to MP spent suffer one point of fatigue each."
I can find no reference to stun in the rules - so is the sum total effect of this to cause 1 point of fatigue per enemy/MP? If it only causes one fatigue then that can be a good start if you plan to wear them down with attacks, but not so good for disrupting/getting away. Could you spend multiple MPs to inflict multiple fatigue points to a single victim?