DMSI 3.3.2, OED, X124, PSEv3, etc.

[Shannon]

After she came out she stood with her back to me and made a show of re-tying her sarong-like bathing suit cover up. Then she sat down and didn't look at me as much and closed her legs.

When a woman is aroused and attracted, she will respond, although what seems "obvious as hell" to her may be very subtle to a male point of view.  Spreading her legs further than normal, especially when they are opened specifically in your direction, and making specific eye contact repeatedly is her way of being "obvious as hell" (female obvious) that she is open to and wants sex with whomever she is doing this for and towards.

Age, experiences and personality will dictate how obvious these signals are, and how long they are given before she - seeing no appropriate response to indicate he is noticing and receptive to her "obvious sexual advances" - will give up, concluding that he is either clueless or uninterested in return.

I wonder if setting one's intention as one uses the sub makes a difference?

Theoretically it is possible to consciously trigger and direct the standard sniper, but not many have reported success in doing so.