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In X-COM 2, it's been reported that on overwatch shots, there is a 70% (when moving) or 60% (when dashing) penalty to aim, but the enemy no longer has cover to make up for it. When using an ability that allows overwatch to trigger on enemy actions, not just movement, what is the penalty? Do they still have their cover, in which case you might as well just shoot at them? Do they not have cover and have a 70% aim modifier, as if they had moved?

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  • I think the aim penalty for dashing targets is actually 49%
    – Dragonrage ♦
    Commented May 10, 2016 at 17:29
  • @Dragonrage Any source for that? All the questions here, based on the configuration files, point to a .6 multiplier.
    – Kyle W
    Commented May 10, 2016 at 17:51
  • I was reading something about it in one of the wikis. It may be wrong though. Let me see if I can find the link.
    – Dragonrage ♦
    Commented May 10, 2016 at 17:54
  • xcom.wikia.com/wiki/Overwatch
    – Dragonrage ♦
    Commented May 10, 2016 at 18:31
  • @Dragonrage Do you have any references for xcom 2?
    – Kyle W
    Commented May 10, 2016 at 21:47

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When using an ability that allows overwatch to trigger on enemy actions, not just movement, what is the penalty?

The overwatch aim penalty gets applied to all overwatch shots*. This includes normal overwatches and covering fire.
The explanation for this is that it is a reaction shot; a quick reaction by the soldier who fires his gun; therefore his aim is reduced as opposed to an "aimed" shot (normal shut during your turn). The aim penalty is therefore tied to the soldier taking the shot and is independent of what the soldier is shooting at (other aim buffs/debuffs can still have a stacking effect, of course).

But when an enemy takes a shot as opposed to running away; they will still have their cover because they never moved away from it.
Even if an enemy is behind full cover and side steps before taking a shot; the full cover will still be in effect. The side step itself is not considered movement and will not trigger an overwatch, but the shot (that caused the side step) will still trigger Covering Fire.

This does mean that Covering Fire reaction shots have a worse chance to hit than a normal overwatch shot. For this reason, you should only give CF to your soldiers with above average aim (and who have other reaction shot bonuses); or else you'll just be wasting bullets most of the time.

*Technically, it gets applied to all reaction shots. This includes overwatch shots, reaction shots that occur when a suppressed enemy makes a move, the Return Fire pistol shots, and other "automatic reaction shots" (e.g. the Close Quarters Combat perk in XCOM EW. It exists in XCOM2 too but I'm not sure if it has the same name).

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