וַיִּקָּרֵא֙ אַבְשָׁל֔וֹם לִפְנֵ֖י עַבְדֵ֣י דָוִ֑ד וְאַבְשָׁל֞וֹם רֹכֵ֣ב עַל־הַפֶּ֗רֶד וַיָּבֹ֣א הַפֶּ֡רֶד תַּ֣חַת שׂוֹבֶךְ֩ הָאֵלָ֨ה הַגְּדוֹלָ֜ה וַיֶּחֱזַ֧ק רֹאשׁ֣וֹ בָאֵלָ֗ה וַיֻּתַּן֙ בֵּ֤ין הַשָּׁמַ֙יִם֙ וּבֵ֣ין הָאָ֔רֶץ וְהַפֶּ֥רֶד אֲשֶׁר־תַּחְתָּ֖יו עָבָֽר׃
And Absalom chanced to meet the servants of David. And Absalom was riding upon his mule, and the mule went under the thick boughs of a great terebinth, and his head caught hold of the terebinth, and he was taken up between the heaven and the earth; and the mule that was under him went on.
Rashi on II Samuel
Avsholom happenned. Denoting something that just happened, a chance meeting.
Rashi on II Samuel
He was hanging between the sky and the earth. Our Rabbis said3Sotah 10b. See Meharsho there. He unsheathed his sword to cut his hair and saw Gehennom open beneath him.