hiv prevention is straightforward because there are only 3 ways to transmit it. To reduce anxiety, it is simpler to focus on the 3, rather than spend a lot of time studying all the other things that you can think of.
First, in looking at your previous thread, you had ZERO risk from the exposure you've written. The transmission of HIV takes place inside the body and that is why ONLY unprotected vaginal or anal sex or injections with drug needles that are shared is a risk. blood, semen, vaginal fluid all could be routes of transmission but air inactivates it as does saliva and what you previously described posed ZERO risk.