Salsa is about flirting, about love, about passion about trust. For that moment on the floor he owns her. She is his to do what he wants and he takes that responsibility seriously and is a perfect gentleman. She knows that he will not let any harm come her way. He wants to show her off to the world. Show off the fact that she is with him. He knows that while dancing all eyes will be on her and he will just be a background presence and he is OK with that. She does her best so that she looks good for him.
With each turn he leads her into, he tries to imagine what his life would be without her and the moment she turns away he cannot bear it and pulls her back towards him. At the same time he knows that there are times when they both need their own space. And so, when he leaves her to do her shines while he is doing his, he knows that there is a chance that she might just walk away, or might get whisked away by another partner, but he has that faith in her and the confidence in himself that she will come back to him.. The same for her, she knows that when he is letting her go, it might be for good. But in the end they both come back to each other (or find a new partner ;) ). With each drop he lets her know that no matter how hard she falls he will always be there to catch her and lift her up. Every time they get tied in a lock they know that no matter how tricky the situation is they will come out of it sooner or later.
All these stories, these feelings, these emotions form the beautiful dance of Salsa, and I have just listed a very tiny portion of it and I hope I have done justice to it. There is still so much to explore.
Ps. This is just my personal interpretation of the dance. There can be different thoughts too! :)