Loot Dropping Out of Bounds

Finished the boss on Savanah, the centaur boss. As the boss died on his little pride rock outcropping, and his minions jump into play from the cliffs above, my arrow hit one outside of the map apparently and had me miss some good drop in an unreachable place. The only reason i knew it happened was the loot filter. They shouldn't be targetable until they're within the confines of movable area.