What gives? I'm not sure about you, but if i was shot by an arrow and it impaled my body, I might not go back on my merry way if i didn't find something for 15 seconds. Same goes for having multiple targets. You can pretty much kill one in plain sight of others and eventually they will just go back to whatever they were doing as if it were nothing only seconds after giving up a search.
I play on the hardest level by the way and i'm like a level 12 character. I'm not THAT powerful and it just is a little bit of a let down to say the least. Love the game otherwise I suppose.