I need to go to Vegas...
Keep in mind, it is 4 am and vegas. It could be that some of the girls have been drinking and their shields are lowered.
1) Just remember to keep your posture and use compliance tests if you're not sure where you are. You're speaking about mystery method with A3 and C1 etc, he claims you can kiss a girl in A3 and anywhere in comfort. I personally wouldn't say that I want to finger it, but if it's your thing and you can say it in the right manner you could always give it a shot. Every mistake is a lesson learned and it's high risk/high reward.
2) It's the escalation pattern really. You get really close up in her face, if she doesnt move her head back or flinches you can go for a kiss normally. Especially added with the slow seductive talk. When I'm not sure though, I use a thing that I've seen in Gambler's video on this website. Where he moves in very close to speak in her ear whilst maintaining eye contact. That puts your face even closer. It is another test as well as being seductive. Since it looks and feels like you're about to go for a kiss, but you're not (unless ofcourse you see she expects and accepts a kiss).
3) If it is in the opener, I take it as an IoI personally. Also the matter of saying it matters to me.
If I cannot read the way she means it I throw a playful joke. "Yeah, I look that way to draw in unsuspecting girls. Inside I'm evil, so better run while you still can!"
If it is said in a very nice way I usually just thank her.
If it is said in a more seductive way, I hold eye contact for a few seconds without saying anything. If she holds it I tell her she looks like she wants to make out, which could end in a make out. If it doesnt end in a make out it is no rejections, since you made an observation and did not ask a question.