A man puts himself in a gangerous situation to save a stranger's life. which two themes most clearly interact in this story?

I would say that two themes that can interact in a story like this are empathy and heroism.

Explanation:

In a story where a man puts himself in a dangerous situation in order to save a stranger's life, the main character (the man who saves the stranger) should feel empathy for others, because otherwise he wouldn't act on it when he sees the other one in danger, he just wouldn't feel anything. In this case, he clearly feels for the stranger so deep, he needs to act about it. And heroism is the other theme I chose because you can feel sorry for someone else's situation, but it doesn't mean you have to risk your own life in order to save him/her. This attitude describes someone heroic.