Various scenarios play out in my mind. I will preface this by saying I'm terrible in a fight, and I know it, so it's rather easy to terrify and incapacitate me. Hence my paranoia.
Scenario 1:
I've known the guy for a long time, and am willing to do stuff. So I try to talk him out of it being there and then, and say "let's wait till it's really private, you know these things have cameras."
Scenario 2:
I've known the guy for a long time, and am not willing to do stuff. So I try to talk him out of it completely "I'm sorry, you're just not my type. Please restart the elevator." If he continues to push, it will gradually go from that to "no, touch me and I'll cry rape."
Scenario 3:
It's someone I don't really know very well, but have been interested in during the short interactions we've had. Reaction will be fairly similar to 1, but there will be a lot of blushing with me thinking "omg I can't believe he really likes me!"
Scenario 4:
Someone I don't really know but during the short interactions he's been creeping me out. I shrink away from him and say "I'm sorry, but you're really not my type. Please restart the elevator." If he pushes, I keep trying to get away. My reaction is flight. Also, through roleplay, I found out that there's no way for a guy who's raping me to keep his dick inside me if I'm conscious. It's actually easier for me to get a dick out of my pussy than it is for me to keep one in. And if I'm unconscious, well, same problem. There's a slight chance he'd give up due to the difficulty. (seriously, I don't know what's wrong with my pussy...)
Scenario 5:
I've never seen this man before. "What are you doing? Wait, no... leave me alone!" (and a lot of trying to get away)