Yo, i'm only 16 and aspiring to be a PUA. Here's an opener me and my fellow PUA discovered by accident because we have approach anxiety at the first PU. (yeah i know, what the fuck does this kid know?)
You come to an HB and say:
PUA: (apply false time restraint)"Hey, can you reject us/me?"

*if she rejects you - it can break the ice of approach anxiety(they rarely reject you)
*if no - "why? don't you wanna reject me? you must like me then"
OR
"oh, so you don't wanna reject me the" move on to next opener, universal opener works just fine
*if why? - (just make up bullshit) like:"my horoscope says that i have to take it easy on meeting new people 'cause i met end up getting hurt, and that hasn't happened, and i've already met a lot of people, especially women"
*if i don't know - neg her like: you must be too nice to people, what if a loser comes up to you, he can just pick you up just like that."