I fled the scene as quickly as I could, remarkably unnoticed. Yet despite my amateur error, I got to see how thorough the enemy was in searching and tracking down my location. If you thought they searched extensively in Ground Zeroes, then think again. Their search radius is huge and it seemed like around 15 minutes before they gave up. During that time they split up into packs and not only examined my last seen location, but just about every other hiding place around it. They are even able to not only track your footprints (which we gear in the PS1s MGS), but also the hooves of your horse too. So its even more important to complete missions unseen, because you could find yourself spending a lot of your time hiding in the bushes.