The Hebrew says only "two Hebrew men." The Targum Pseudo-Jonathan on Exodus (2:13) names them.
"And he went out the second day, and looked; and, behold, Dathan and Abiram, men of the Jehudaee contended; and seeing Dathan put forth his hand against Abiram to smite him, he said to him, Wherefore dost thou smite thy companion?"
These names are not random. Dathan and Abiram will appear again — decades later, in the wilderness — as the two men who join Korach's rebellion against Moses (Numbers 16). The Torah's readers meet them in Numbers and wonder: who are these people? The Targum answers: they are the same men Moses once tried to save.
Read it slowly. Moses walks into a fight and sees a Hebrew raising his fist at another Hebrew. He steps between them. Why do you strike your companion? Forty years later, the man he tried to protect, and the man he tried to restrain, both stand in the desert and accuse Moses of being a tyrant.
This is one of the most tragic foreshadowings in the Hebrew Bible, and the Targum refuses to let it stay hidden. Moses's whole life is bracketed by these two. They are the first people he tries to help inside Israel, and they become the most bitter voices against him inside Israel.
The lesson is not that we should stop intervening. The lesson is that some people will never forgive you for having seen them at their worst. Moses saw Dathan's fist mid-swing, and Dathan never forgot that Moses saw it.
Beloved, every act of rescue sometimes breeds a resentment you will have to carry quietly for forty years.