When using Force Cone on a mob if there are monsters in the second row from your character the ones closest to you don't slide. I've noticed the cones seem to apply damage and effects in the nearest row first from right to left moving backwards. This means the monster in your face is prevented from sliding back by the monster behind it, who then slides back later in the resolution. Not sure if the resolution order is this way round for a different reason but if it were reversed this would probably be fixed.
