FURTHERMORE, the rules introduce another VERY interesting concept. They actually say that a sub can be held hostage in a zone, unable to go anywhere unless 1) the enemy destroyer above it leaves or 2) the sub fights its way out. In other words, a sub, when under an enemy destroyer, must either fight or “be frozen”. So it’s kinda trapped! Just move your destroyer to the same zone as a sub and then choose not to fight it; then the sub will be frozen until you move! The sub won’t attack you on the sub’s “turn” (even though the option is there) if the firepower of your fleet above it is too powerful! This “freezing of the sub” occurs because the rules say “If a submarine enters a sea zone containing an enemy destroyer, it MUST end its movement there.”
I’m afraid you’ve got this wrong. The rule you quoted means that a sub must stop if it encounters an enemy destroyer after it starts moving. If it begins its movement in such a zone, it may leave, as it did not enter the zone during its movement. Moving into a zone with an enemy destroyer merely stops a sub’s current movement - it does not pin the sub indefinitely.
So my question here is as follows: If a sub decides to fight it’s way out, and after one round of combat an enemy destroyer is still above it, can the sub just “chill out” and “just be frozen under the water” again AFTER the enemy retaliates for that round? OR does the sub have to fight to the death?
In this situation, if a sub were to attack rather than move away, it would have to fight to the death, as it could not submerge and would have no legal way to retreat. However, as I mentioned above, it may leave the zone, so it could move to an adjacent friendly zone and come back in combat movement before attacking, thus establishing a retreat route.
BUT, if NO DESTROYER is present, can the sub attack the fleet above for just one round, and then move two spaces away during non-combat movement IF the counter fire didn’t kill the sub? If a destroyer IS present above and the sub DOES kill it, can the sub move two spaces away during non-combat movement?
Neither of these is legal. Any land or sea unit that either made a combat movement or participated in combat may not move in noncombat movement.
I hope this helps.