Lost animals.

Just experienced a bow hunters worst nightmare, a lost animal. I was hunting in the rain when a decent whitetail buck slipped into range at about 20yds. I drew down with confidence and let fly, heard the reassuring whack and watched the buck take a few hops then stop. I thought for sure he was going down when he walked over to a thicket and stopped. As he disappeared into the thick brush I settled in and gave him about 30 minutes but much to my dismay the light rain that had been going all morning opened into a full fledge downpour. I recovered my blood soaked arrow but failed to find any sign of a blood trail. I seached the last place I saw him with no sign and then began walking circles and still nothing. Its heart wrenching to know that you put a good shot on an animal and did not recover him. I guess its part of what makes archery hunting the thing we love and the challenge that can either take you to the highest high or the lowest low.