The lack of personal connection VDS displayed on the hotel video could be indicative of his callousness and cold-blooded disdain for women. He appeared comfortable, arrogant and remote (towards SR) once he had accomplished his goal of getting her through the hotel door. Perhaps, some acquaintance rapists display some flirtatious behavior prior to rape, but with a psychopath and/or rapist, do not believe there is any correlation between flirtatious behavior and rape. Not about our understanding of sexual attraction, how one would would behave prior to the act, etc.
I see him as the type that would use charm to lure women then drug them and take what he wants. So the lack of charm on the video makes me think he took her to his room for some other purpose.JMO