I think there's more to teh story than that..fellas.
Look at the pictures where Brian found blood on the grass..and look where teh deer fell.
Its all tall brown grass.
If a deer is running full tilt, blood will be coming out and going out to the sides and that is why its smeared along the grass blades. In that type cover there won't be a lot of blood on the ground.
At the end of a 120 yard run, with those kinds of wounds, you probably are not getting a lot of blood anyway at the end. Running full tilt often produces a misty haze of blood...the deer could be pumping blood out its mouth too, in a fine mist.
I cannot tell from the photos whether there was the S cut or not...just cant see them well enough with these old eyes...but I think there's plenty of blood that came out, you just won't see it on the ground because of all the ground cover int he form of brown grass and weeds.
The blood didn't disappear...if there's none left in the body, it had to go somewhere. My guess is its all over that grass and if you walked in there with blue food coloring dyed hydrogen peroxide and spray it in a mist on that grass, you'd see blue foam everywhere!