Very plausible.I think he probably rushed her, put his hand over her
mouth (since Clint heard the dog but not Holly), and threatened her with
the knife, cutting her to emphasize how dangerous he was and to make it
clear that he had no qualms about cutting her again if she didn't comply
with his demand to go into the woods with him.
Some of the news articles seemed to intimate that the DNA of the blood
might be traced to someone other than Holly.
One news article said that the results of the testing on the blood were in
but that LE would not release that info on whose blood it was
until an arrest was made. Maybe that was just media hyping the thing
but it is what made me think he possibly cut himself a little when abducting her.
This is the type of thing I have read happens in many crimes involving a
knife.
A slashing move might not cause a hand to slip resulting in a cut to the
perps hand but a stabbing or jabbing might more easily cause a hand to
slip forward onto the knife blade.
I am hoping he stepped in the blood and thus left a more readable print.
Note: I am even guessing about a knife having been involved but it is low
tech, quiet (compared to a gun), simple and is something that would not
stand out when carried by a hunter or by someone dressed as a hunter.