And another thing, if he was masked and she was gagged, what was the point of hitting her and knocking her out? She couldn't scream or identify him. Plus, it seems counterproductive to bind a person's extremities if you intend to commit rape.
The pieces of this story don't fit.
Rapists often beat their victims far more than is strictly necessary. More than a few serial rapists have been known to bind their victims. Read something by John Douglas. You'll learn way more than you can stomach about rapists and their MOs. Hell, just read a newspaper.