Rashi: This repeats the rebuke until now. Why do you scream? Did an innocent person ever perish...? It says "Yegunav", an expression of stolen, for Ru'ach ha'Kodesh does not come to Goyim openly. This is like a king who goes openly to his wife, but covertly to his concubine. So Hashem spoke to Avimelech, Lavan, Bil'am and Elifaz at night (Vayikra Rabah 1:13). It says about Nevi'ei Yisrael "Peh El Peh Adaber Bo" ¹ !

Devar Eliyahu: "Mayim Genuvim Yimtaku", but only for a short time. Nevi'im receive Nevu'ah during the day, like a flowing river.

Malbim: This was not a full Nevu'ah. It was like seeing via a cloudy glass. R. Meir holds that even Moshe asked to understand Tzadik v'Ra Lo, and was not answered (Berachos 7a)! The Rambam lists seven differences between Moshe's Nevu'ah and that of other prophets - this had all the shortcomings. (a) He did not get a direct Nevu'ah, rather, like a lightning bolt at night, and afterwards it is dark again. The coming verses discuss the other shortcomings.

Rashi: I heard a small Ru'ach of understanding. Devar Eliyahu - I heard only the core.

Ibn Ezra: Shemetz is something bad, like "u'Mah Shemetz Nishma Bo." My ear was not able to hear the good.

Malbim: The second shortcoming - the Nevu'ah came as a parable and riddle, and he did not understand it fully, like a dream with idle matters.