וַיָּבֹ֥אוּ הָרֹעִ֖ים וַיְגָרְשׁ֑וּם וַיָּ֤קָם מֹשֶׁה֙ וַיּ֣וֹשִׁעָ֔ן וַיַּ֖שְׁקְ אֶת־צֹאנָֽם׃
Lalu datanglah para gembala dan mengusir mereka. Tetapi Musa bangkit menolong mereka, lalu memberi minum kambing domba mereka.
Rashi
ויגרשם AND THEY DROVE THEM AWAY, because of the banishment into which their father and his family had been driven (Midrash Tanchuma, Shemot 11).
Da'at Zekenim
ויקם משה ויושיען, “Moses arose and saved them.” From the use of the word: “he arose,” it is clear that that the male shepherds had thrown Yitro’s daughters into the troughs, as a punishment for their father who had become an outcast for his religious beliefs, and who had rejected idolatry as a result. (Sh’mot Rabbah 1,32.) The expression ויושע makes it clear that the persons helped had been in mortal danger as we know from Psalms 69,2: הושיעני אלוקים כי באו מים עד נפש, “deliver me, O G–d, for the waters have reached my (soul) neck.”
Sforno
ויקם משה ויושיען, seeing that both parties to this argument were non-Jewish, Moses did not intervene by avenging the wronged party but only made sure that he would redress the injustice done to the innocent party.