If the enemy is not visible from the origin of the blast, they will not receive any damage. They only work
on completely open terrain, and only if there isnt another player blocking the explosion.
I posted about this a few patches ago and nothing has changed, is it intentional that explosives cannot be reliably used?
For example i was trying to clear out a camper from the underground section on precinct, i shot 6 rpg rockets total and some underbarrel grenades within 1-2 meters from him and he was still there.
Another one: Just detonated an IED downstairs A insurgent push, guy was still prone there and killed me.