inflict stun on the target of the ai card i assumed, got alot of focused ai cards drawn in my playthroughs but not a stun.
Agreed that there's no rules in the book for it, but I'd imagine it should be "(Stunned Symbol). Stunned State. By performing the instruction in which this symbol appears, the target Character gains the Stunned State." Three above wording is drawn from a mix of the Aggro rule and the Focused State rule.