This is the kind of stuff I'm talking about.
Another good test is to clasp hands mercy fight style, and then lower them waist level and see if she keeps it going.
Or butting heads softly/gently, and see if she leans in or not.
***A really interesting thing that I've also noticed is girls UNWILLINGNESS to displace themselves physically in ANY WAY WHATSOEVER until they are into you (usually attraction, but sometimes also with deep rapport).
So basically, you may notice stuff like if you try to do the spin-maneuver on a chick who thinks badly of you, she'll refuse to spin. If you say to a chick "your arms are crossed.. you look uptight", and she isn't attracted yet, she'll REFUSE to uncross them.. Literally, she'll keep saying "I'm cold" and she won't uncross them for ANYTHING. Same thing when you suggest moving venues. If they don't like you, it will NOT happen. Chicks just won't displace themselves for guys they don't like.
If you try to make a physical move too early in the sarge, you have fucked up the sequence, and the sarge often ends.
HOWEVER, sometimes girls will mumble shit like "not yet", or they might decline a #close or something, but STILL keep flirting and talking to you. That seems to be a subconscious way of saying "I'm not wet enough yet, but if you keep sarging me I may be there soon".