card says " Highest FP AI closest to a unit that just acted" Fire
Does that mean you fire at that unit???
If it does mean that and you AI does not have LOS, then I assume you move to the next tactical order??
First of all, the order is "Fire", so it's pretty clear what the AI needs to do :-)
If no AI can fire at the unit that just acted, then you skip the order.
If only a single AI can fire at the unit that just acted, then that AI is the one you choose for the order.
If multiple AI can fire at the unit, you choose the one that has the highest FP, and that fires at the unit.
If multiple AI can fire at the unit and they have the same, highest FP, then you choose the one that is closest to the unit.