HIV and AIDS
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Hello from JustAnswer.
There has never been a documented case of transmission of HIV from spit in an encounter such as your first example. In fact, there also have never been a documented case of transmission from saliva transferred during kissing, including situations in which there is presumably drops of blood present.
There also would not be risk associated with blood found under the fingernail, because there is still no route for the virus to enter the body.
There is a theoretic risk of transmission of HIV whenever there is bleeding from a fresh cut or sore from an infected person that then comes in contact with an open cut or sore on a recipient person. This theoretic risk can create risk in situations that are clearly otherwise without risk, such as shaking hands. But the reality is that this is not a situation that is found to typically be the method of infection. It is worth noting that if there was any realistic risk associated with such encounters, then virgins are at as much risk as anyone else, and it is unheard of for a virgin (that is also not a drug user) to become infected with HIV or any blood borne germ.
I am not sure what you are asking that is different than what you asked above, but if you are asking the same question again for emphasis and repetition, the answer is the same that there is no documented case of transmission in such a scenario.
Then the answer is the same.