Thanks, and does cover affect grenade damages? or it is just how pack your models are?
This grenade - cover mechanic is one of the whackiest points in CoH2.
(Sander correct me if I am wrong)
While cover is directional, grenade damage behaves very weirdly, because as far as I know, the directionality is not calculated from where the grenade explodes, but from where it was thrown. So if you charge an enemy in green cover frontally and lob a grenade behind the enemy, the enemy will get a 50% damage reduction because your squad was still in front of green cover. If you flank them, come from behind and throw it directly at them, the enemy will take full damage although the points of explosion are the same.
This leads to weird situation in the game for assaults on units in green cover: If you are already reacting a bit late and did not see the enemy grenade in time, it is often better to just take the damage to get the 50% damage reduction. Don't panic and retreat instantly, because as soon as your infantry leaves the cover they do not get the reduction anymore and take full damage. Instead, just wait for the explosion and retreat afterwards.