From my experience with a rifle, when the blood ends your deer is very close by or very far away. I hope the shot was as you have stated and you will have a dead deer I would say within a 200 yard circle of your last blood. Thick stuff, towards water, and downhill a lot of deer when hit hard will go those ways. But as far as another hunter dragging your deer off, no gut pile, no drag marks equals they didn' t get him I would have to doubt. I say you need to get back out there with some other guys and keep looking. Last blood usually means they aren' t far or you didn' t hit him hard enough to kill him. Either way goodluck, and all deer are different, I am just writing on my personal experience, but usually my .35 whelen knocks them right off their feet.