In general, if it is not very difficult, it is desirable to completely change the settings of throwing grenades. On such where it will be necessary to choose a throwing angle (for example scrolling of a scroll). Then, depending on the choice of arc, you can choose the throwing range. Then, when you try to throw a grenade at a great distance (small arc) will be the same obstacles as when firing. And when throwing a large arc for a short distance, you can throw above a impenetrable wall (which now blocks 100% of throwing a grenade), if there is no roof over the soldier.