Re: So an imaginary situation:
Well - this reminds me an old story which goes like ..
A guy asked another : what if you going through a jungle and all of sudden a lion comes up - what will you do ?
The guy replied : what am i going to do ? the lion is going to do everything for sure ..
So in a dodgy situation like yours - always wait for the first move … Never take the lead .. if she is just smiling and doing nothing 
not asking you to leave …
Then it is time to close the door - and make sure you lock it this time 