It was meant to be an Activation Move, yeah. I kinda just threw together the description, but in my preamble explanation I mentioned you'd need Insight to know that your opponent has Mimic, thus implying an Activation.
Edit: maybe it should require Foresight too, to get a precog on an imminent Mimic and activate beforehand.
Edit: maybe it should require Foresight too, to get a precog on an imminent Mimic and activate beforehand.