Subject: Re: Reaction Fire
No. It fires when an opponent unit, that could fire at itself, comes into range. Means: If a enemy unit is a threat to your own unit it will be fired at if possible. Otherwhise it will be ignored.
A good example is a corvette. It won't attack "harmless" detected APCs but fire on a submarine automatically if the submarine could harm the corvette after finishing it's move.
Bernd Kosmahl
"Sir, we are surrounded!" - "Great - we can attack in any direction."