וְלֹֽא־יָכֹ֣ל ע֔וֹד לְהָשִׁ֥יב אֶת־אַבְנֵ֖ר דָּבָ֑ר מִיִּרְאָת֖וֹ אֹתֽוֹ׃ (ס)
And he could not answer Abner another word, because he feared him.
Read Kabbalistic (mystical) interpretations of II Samuel 3:11: Zohar and classical Jewish mystical sources, free online.