React to reactions: Is it possible? Dodging a counterattack for example?
Of course; that’s the fun of the reactive actions (as long as you have actions points)
Harod's murder attack. This attack can only be used if Harod is hidden. But it is a close combat attack. Could another character use his free movement in order to avoid this attack since he isn't aware of Harod or could he walk/run away from him if he is adjacent to him, but Harod is still stealthy because he didn't attack or used murder attack?
You can't react with Free Movement to evade a free movement, walk, charge or run of another mini. I mean, Harod will be always able to walk in close combat with another mini and use the Murder Attack.
Can a Character use equipment cards reactively if it doesn't say one way or the other on the card? (e.g., could I use Clock Of Cronos on my opponents turn to gain an Action for Defence?)
The "automatic" cards (I mean, those like Clock Of Cronos, which don’t need to waste an action like Life Potion) can be used like Reaction, even in your enemies turn. So yes, you can use Clock Of Cronos on your opponents turn to gain an Action for Defence.
If a character is in Melee, can it attempt to Escape Reactively in order to use its free move to avoid a ranged attack or block another charge?
Nope.
Timing of free movement actions as reaction: Are they executed before, after or at the same time of the enemy’s action
Since the free movement is a reactive action, you can use it for look for cover against a ranged attack, but you can't use it for evade a charge, since in the same moment an enemy unit is in contact with your mini, you are already in melee
One Movement per turn, can a model which has been already moved this still intercept a charge (basically it uses free movement to do that)?
Yes; a character still can intercept a charge even if it has already move.
Enemy moves and declares a ranged attack. Can the target use free movement to get out of range, duck for cover (no moving action taken this turn yet)?
Yes.
One Movement per turn, can a model which has been already moved this still intercept a charge (basically it uses free movement to do that)?
Yes; a character still can intercept a charge even if it has already moved.
If I have not moved a figure yet and my opponent charges another model, can I use the 2" free move followed by the 2" charge intercept move on one figure to block the charge? Or can you only react with one thing? (i.e. the 2" free move or the 2" intercept but not both)
No, you can not do a free movement and, after that, do another movement to intercept a charge. The only way to intercept a charge is if you are already inside that zone.
If a power is listed as Reactive, can it only be used reactively or can you use it actively? (e.g., Dereck's Neokinesis power)
A reactive skill can be used when you want; of course, you can use Neokinesis in your active turn.
Can one use the reactive 2 inch move to move out of range of a ranged attack?
In Saga 1, yes. But you must declare it before you or your foe measure the distance.
Harod's murder attack. This attack can only be used if Harod is hidden. But it is a close combat attack. Could another character use his free movement in order to avoid this attack since he isn't aware of Harod or could he walk/run away from him if he is adjacent to him, but Harod is still stealthy because he didn't attack or used murder attack?
You can't react with Free Movement to evade a free movement, walk, charge or run of another mini. I mean, Harod will be always able to walk in close combat with another mini and use the Murder Attack.
Timing of free movement actions as reaction: Are they executed before, after or at the same time of the enemy’s action
Since the free movement is a reactive action, you can use it for look for cover against a ranged attack, but you can't use it for evade a charge, since in the same moment an enemy unit is in contact with your mini, you are already in melee
Can I use it(free movement)for look for cover against a ranged attack even if I have already used my free movement in this turn?
No; you have already moved. The only "special move" that you can do after a movement is intercept a charge, as is said in the rulebook.
If I have not moved a figure yet and my opponent charges another model, Can I use the 2" free move followed by the 2" charge intercept move on one figure to block the charge? Or can you only react with one thing? (i.e. the 2" free move or the 2" intercept but not both)
No, you can not do a free movement and, after that, do another movement to intercept a charge. The only way to intercept a charge is if you are already inside that zone.
Walk into to combat. Can you enter hand-to-hand combat only via a charge action or can you walk or use your free movement to touch an opponent's base ?
Doesn't matter how you enter in Close Combat; If a mini walks into base contact with an enemy unit, you are considered in melee. I mean, you can walk, run, charge or use free movement to enter in combat.
Can you do a Shield against a Ranged attack if you have already moved?
By shield you mean shielding another friend unit of a ranged attack, do you? If that’s the case, yes, you can shield.
It says specifically that you cannot intercept a charge while engaged, but it doesn't say anything like that for shielding someone from a ranged attack. Does it have the same restriction, or can you shield if you are engaged?
Also, in terms of shielding and intercepting charges, is the only requirement to be within 2" of the line of charge or fire
No; you don't move and you can't intercept a ranged attack if you are in melee.
As for the other question, I understood it that if you were able to move into the way of the projectile with your 2" free movement than you may shield. If the character stands beside another, it should work easily, if he is behind another I guess you'll have to measure if he could walk around his companion (since he can't walk right through him)