Trying and failing to save someone is read as guilt or helplessness about a situation beyond your control. Tradition sees it as a sign of how much you care, not as a measure of failure.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.