ORIGINAL: PDiFolco
You said the increase in FP was only vs rushing inf... and I comparde a Moving inf in the open to an immobile one (in the open as well). Then you reply comparing a rushing inf in the open to one immobile in cover?
I'm not sure I understand the question exactly, but here's the idea if we're talking about squads in the open - very slow "sneak" movement orders like Defend -> Move are about the same as being stationary. You're slightly (-1) harder to hit but easier (+5) to spot. Orders like Engage -> Move and Rush get the -1 to be hit, but they also get a +10 or +15 to be spotted and a +1 on all firepower against them. That firepowere bonus is a pretty significant effect which outweighs the -1 to be hit.
Being stationary is the best defense since you will often not be spotted at all and thus not shot, unless the enemy is pretty close. Any real movement (normal or full speed) in the open makes you vulnerable, but very slow movement can be almost as safe as being stationary.
Ah, wait - yes, I did only mention Rushing infantry above but that's because of the context. I also pointed you all to the manual where you can see that even non-Rushing infantry gets a +1 firepower against them when moving in the open. Only very slow movement in the open doesn't get the firepower bonus for enemy fire.
Here's a quick summary for movement in the open:
Stationary
No modifier to be hit
No modifier to be spotted
No modifier to enemy firepower
Defend -> Move
-1 to be Hit
+5 to be Spotted
No modifier to enemy firepower
Engage -> Move
-1 to be Hit
+10 to be Spotted
+1 to enemy firepower
Rush
-1 to be Hit
+15 to be Spotted
+1 to enemy firepower
It's also worth noting that when you are not in the open, faster movement types can lose you all cover bonuses, which actually results in a large net firepower bonus for the enemy.
Regards,
- Erik