sp1ke, on 23 September 2015 - 03:26 PM, said:
In original XCom, reaction fire does not always trigger even when it is reserved. I believe this game is the same though I may be wrong? I'm pretty sure I've seen agents on overwatch fail to react to something moving through their line of sight. And who's to say that the baddies in the middle of your pack did pass through the lines of sight of the agents who were left on overwatch? And no one can guarantee a pack was protected by a contiguous circular line of sight of overwatch, because the game never shows us its sight arcs, it only ever tells us after the event (movement) when we don't have a line of sight to a particular target or targets.
It's not as the original, where the reactions/TUs of both units where compared, but there is one requirement for Overwatch - it only happens when the spotter sees the movement of an enemy unit in half or zero cover (I can't remember about full cover) for a set amount of distance, usually 2 or 3 tiles.
For instance, if there's a tree which is on the limit of a soldier's sight and there's an unseen alien at the back of the map that moves behind the tree, then your soldier won't fire since it has only spotted the alien when it arrived behind the tree, not during its movement towards the tree. For the soldier to fire on overwatch it would need to be placed one or two tiles forward, where it can see the tiles that the alien will cross before reaching the tree.
This requirement that a soldier/unit needs to see an opponent for a continuous X amount of distance to fire on overwatch has also another consequence - full cover can also 'prevent' overwatch fire if the movement path of the unit causes it passes through high cover that briefly conceals it from enemy sight. This is not something that you (or the aliens) can control (at least easily) to use but that can have quite an effect.
Oh, and just one tip - if you want to enjoy EU2012, don't compare with the original. It was not designed to replicate the original game's mechanics, and what you know about the original will not help you in any way. It's a different approach to a familiar story - you may like the choices or not and compare general parts like the strategic section (which it's much better than the original) or the soldier attachment (works better in EU2012, IMHO), but if you keep comparing and expecting it to be like the original, you'll be disappointed.